Mole Concept and Stoichiometry One Shot | Mole Concept Class 10 ICSE | @sirtarunrupani​

0:01 Let go So hello and jai hind welcome back to your own Channel Sarani Exclusive Channel for ICC wood student yes my dear superstars i I know you were waiting and so was I I am excitingly ready for today's lesson Mole concept and stochiometry do you Know that many parts of mole concept chapter are All the questions are coming. Yes, I will give you Board questions of 2025, 2024 and more 2023 Yes Last three years board exams Questions were also solved in today's lesson I will get it done. This chapter is absolutely crystal clear

0:46 Will be done. meaning after this the mole concept In your fist. Yes. today is the turn of moll Concept and Stochiometry. So the word The price comes. yes yes what is the mole? Mole price. no no yes say in hindi language Isn't it true? What is your worth? yes here that mole Not there. Mole is a unit. There is a heap. Heap Yes yes there is a collection. that's just his name Mole. Now sir whose collection is this? So the collection of particles. Collection of atoms. Collection Of molecules, collection of ions and that has A fixed number. This is exactly what is called value.

1:36 Did you understand this? then you understand the value Went. What is Stochiometry? Yes. Stochiometry This is the name of the measurement. Chemicals in Units To major in. Please tell me their quantity. So Superstars R OP please write it quickly

2:25 Stoichiometry will become very simple. And From Educ. Yes, I have prepared it for you in Educ Yes, all the years from the past You can ask questions. in which previous

4:12 Yes, superstars watch ROP

6:34 There are Numericals in the base of MCQs in base and you will get long questions which Choice in section B will also be available on choice basis Are. Meditation on Approximately Eight Numbers Listen to it from. Eight to yes, eight to 12 yes between is not fixed yet because Currently its mark print is being prepared. So approximately eight days are of 12 marks This is a single chapter. so you this chapter Can't miss it at all. If you get 12 Don't miss marks in chemistry Are. So, let me start. from the very basic I told you the chapter will start from The very basics to the advanced level. To all First, let us understand some definitions. Yes, you get a The term will come. Definition was asked last year also

7:19 Was. This definition was asked in 2025. What is Gay Lussex's Law of Combining Gases or Combining Volumes. So what is your name? g Luceaux Law? Yes. This is what the law says that when gases combine, what happens Gases combine to form the product and they form a product which is a gas. in between them There is a ratio and that ratio is always It remains constant. yes this is g lusex Law. Let us understand this. What is? when the gases react when there are gases why sir Why are you explaining so much? On this It is numerical. Numerical based on this Is. Look carefully. So when gases react

8:07 if it does then there would be volumes between them Are. Vo Volume Simple Whole Number Ratio occurs in and the temperature of the gases and if If the pressure is not changing then their The volume remains constant. Sir this Please explain. Sir please explain this. Yes, let me explain this as well. just that It is said that when the gases combine Their volumes will be in some ratio and they The ratio will not change. yes, an example I understand. Hydrogen and oxygen. See Hydrogen is also a gas. remember this rule It is being applied on gases. So hydrogen and is combining and producing oxygen It is doing water vapor. When we do this We do? write it something like this

8:54 Are. what do you write? See 2H2 + O2 gives 2H2O Now if you look carefully at this you will you'll see that hydrogen remember that It is very important to have a balance in the equation. It is very important for the equation to be balanced. in front of hydrogen yes now you will say sir this Two is up next. What is this? if somewhere the number Somewhere the number is written ahead of an element like I wrote about hydrogen and its

10:07 It may or may not be found alone. But Just look carefully. Look at the screen. in one molecule in any one molecule that

10:59 How many atoms are there in a molecule

11:54 does it come? In this, your normal gas which you and

13:06 This means oxygen is diatomic. Yes, No need to write forest. I to explain For this one is written. Did you understand it? Similarity to Nitrogen N2. I understood the point Isn't it now? Now understand mono atomic and di atomic I came. So what could happen next? It could be tri atomic. yes why not It is possible? Tri atomic. Tri Atomic What will happen to me? There will be three atoms. There will be three atoms which will be formed? Forest Molecule. Like ozone. Example of this What is? Tetra atomic number 3 and above Tetra atomic. That means there will be four atoms. There will be four atoms and what will they form together? A single molecule. Yes. yes phosphorus P4

13:54 Now I understand, I understand the example If atomicity is understood then if the He was talking about atoms, listen carefully are the smallest individual particles These atoms will combine and become Molecule. So what do we do in gay sex law? I want to tell you that the molecules that are They are written ahead. Like we wrote 2H2 + O2 gives 2H2O Now you see, this is your balanced equation Is. So what is this two representing? This one in the front is its molecule. This is its molecule. and this little one

14:39 It's two, what is it representing? it Atom. Is it clear now? Where is the atom? Where is the molecule located? it is clear Went? Now Here it is known that hydrogen has two Volume. How much? Two volumes of hydrogen and a volume of oxygen added Produces two volumes of water Vapor. Please pay attention. G Luxeux Law Gases It gets applied. Liquids Pay, Solids Pay does not apply. So this is the ratio is 2:12 What is this? This is the ratio constant. what does it mean? If the temperature and pressure If the change is not happening then this ratio should change

15:27 Will not done. As an example if Here four would have been written instead of two. For Example: It is written here 4H2O then balance Here comes 2H2O and here comes the balance to have 4H2O. Now you will see that The number has changed. Sir you said that The numbers will not change. yes i said it The numbers will not change. But when you do this Simplify further. See what's here is it written? Four. what is written here? Two. And what is written here? Four. Now you this We will simplify it. Now you simplify it If you do then 2:12 He will come soon. So what happened to you? Yours The volume is constant. want to tell this are in Gelodox law. Is it clear? Understand the point

16:13 Have I come? What the Gay Sex Law wants to say Are? Did you understand the point? So this is on gases is applied and the reactants of the gases and The ratio between the products does not change will be. Ok? Did you understand the point? Its We have seen the example. now come now We are going to talk further when we talk about Guess Law when we talk about then a word comes after it is that what will happen? what will happen if that what if there is equal volume of all gases The volumes of gases are equal. Ok? Equal volume of gases under the same condition of temperature and pressure contain same number of Molecule. this concept yes this concept

16:59 In which they want to tell what are gases Is? that the volume is same then its number of The atoms will also be the same. What is a keyword? What is a keyword? that the volume of the gases is same Is. Did you understand it? If 1 liter off liters of carbon dioxide, then if If it is, then its number of atoms will also be the same. Yes, did you understand? what are they will it remain? The number of atoms will be the same. I of the month I am not talking. relation between whom am I in? number of atoms and volume of

17:59 Tells. Yes, a defined heap of heaps of Like if I ask you, is it in a dozen?

19:41 * 10 to the power 23. you print this number Take it. Keep this number in your mind. what did you do? I told you this number, mind you I have to make him sit. what is the number? 6.022 * 10 to the power 22 because this is the number is called the Agadros number. Yes what is your name? Agadro number. And you have given this definition above. Read it. You just read a definition. What did you read? that what if? The volume of gases should be the same. If the volume of gases is same then its number of The atoms will also be the same. What is a keyword? Volume of gases being same. Understand the point Have I come? Did you understand the point? Isn't it?

20:29 Did you understand the point? What is this called? Aogdros Law. And the number that I mentioned is one mole in 6,022 10 to the power is 23 atoms, there are particles, there are ions, There are molecules. What is this? this is it Aogadro's number. We call it yes, it's one mole Tells the value of . Ok? What is forest Mole? Do you have it clear? Now 1 mole is clear what happens? 1 mole What is? see now like 1 mole off Let's talk about hydrogen. what is 1 mole off If we talk about hydrogen, then when hydrogen is used Even if there is one mole, what will be the number? 6.022 10 to the power 23 molecules of Hydrogen. And if we talk about sodium... Will it fall apart in that? No. Sodium

21:14 I will be the same person too. one mole of sodium Same thing will happen in me too. 6.22 * 6.022 * 10 to the power 23 sodium atoms. Is it cleared? The concept is clear till here Done? Look at the theory and numericals on this The numerical portion will be more in this From the chapter. Yes, there are theories about this From the chapter. Aogdros Law has been asked many times. Yes. Last asked in the year 2025 Gaysex Law. Ok? then you should come Very well. Till here the matter is becoming clear Is. Now let us understand molar volume. So Occupies the volume equal to one mole of gas the molar volume is named after it And this volume is also fixed and that is fixed How much 22.4

22:01 Remember the number of liters I said 22.4 Remember the liter fix? 22.4 liters if it is in liters and centimeters if If it is in cube then 22400 Centimeter Is it clear? 22400 If you want to write in milliliters then it is fine too Is. But what is this? At STP. This only is the molar volume of any gas. What? Any Too. If you ask me how much is one mole What is the volume of carbon dioxide? How much What is the volume of oxygen? How much volume off Is there hydrogen? I am the same answer in all I will tell you because you said that for a price All will have 22.4 litres. Is it clear? talk

22:46 Did you understand it? Now let's talk about the price Did you understand the concept? Moles and Volumes Did you understand it? Ok? Depend on mass There is no volume. Please pay attention. Ok? Now let's talk about the questions. Some examples of. so I just put together a photo for you We have given an example and after that we will tell you about it We will also ask questions. yes, the first one I am telling you the basics. Then yours and I will prepare for numericals. A Humble I would request you guys that this please please please please please please chapter We have to look at it less from the perspective of theory. will come Theory. I am saying the theory will come. Definitions that you just read and heard of the sex law, of the Agadroz number, of the Agadroz of law. Isn't it? This could be a theory let's go. But numerical will come from this chapter and

23:33 These numericals are very easy. Only Understand the basics and similar type of questions Whatever I am doing on the board will come. saying it right I have been. I have to give you the board for 2026. Yes, then rest assured that the kind of am I getting the numericals done on the screen or I am getting it done on the board. of the same type The numericals are coming. Yes, I have boarded A lot of numericals have been given and There are some simple numericals which will help you in finding the correct answer. This is for explanation. Let's first of all Let's look at the questions. Now you look at your What volume of oxygen do you have? to you what are you asking? ask the volume of oxygen Used to be. See, he is asking the question What volume of oxygen? means what to us Want to find it? find the volume of oxygen Have to do it. that is required to completely

24:20 Reacted with 4.48 liters of hydrogen. To you Remember this whenever such questions come The equations will be given. need to take tension Not there. What? Yes, yes. talking about the board I have been. what am I saying? you this You must have given the equation. if you are a given Numerical of mole concept. To you It will always give an equation with numerical. If there is an equation in that question then give it It will be. And if atomic weight is required then that will also be given. Listen to it again. Equation will be given to you. don't worry about Equation. And if you are worried about weight to remember the atomic weight If you are worried then just read the first 20 elements

25:07 till. Hey, make it up to 18 elements. To Argon Do it brother. from hydrogen to argon Do it. Ok? Calcium comes in 20. Whether from hydrogen to calcium remember this. Whether from hydrogen or argon You just need to say no further than that. Why? I am saying this because atomic weight is also There will be a given. Yes yes, it will be given. I say I am here, it will be given. talking about the board Am. Yes, let's look at our screens. One The question here is clear that the hydrogen It has two volumes. it is reacting Where is it written that one volume of oxygen is Is? I told you to write one here There is no need. Forest ahead. Yes, if a number If not, it will be considered as forest. so one is the volume of oxygen and by combining

25:54 This is forming water vapor. clear? So what became of the relationship? make a relation here If there is nothing here then there is forest and here so this is what we call it Luce Law Yes Luce Law 2 1:2 Yes what is becoming this same ratio constant This is a ratio, this ratio will not change given This ratio changes with temperature and pressure If it is not there then sir what is its numerical value If there is a rule then now you see whose rule you have Volume given is 4.48 Liter of hydrogen. You will get the volume given is 4.48 Liter of hydrogen. asking about whom Is there volume? I am asking whose volume is this?

26:39 Asking for the volume of oxygen. So you How to start? See you start Something has to be done like this. I do it here I will give it. Look, I'm doing it up here. See two volumes of hydrogen. Look at the volume of hydrogen There are two. This is evident from number two. Two Volume of Hydrogen

27:46 will come 2.24 1 mole of or one volume of hydrogen

28:44 How was it used? Now let us tell you about atomicity

31:57 formula should be removed in which the actual number of actual number of elements na Let me tell you. what is the word? in which the actual number of elements, real number of Elements should not be mentioned. We call him What? Empirical. Let me give you an example. Let us go Let me give you an example. Just look at this. So Just look at this. Here is the empirical formula. C I am writing again. Yes. Empirical The formula is CH2O Yes, this is an empirical formula. Ok? Now you see the ratio of this The elements in it are the ratio of carbon there is forest. The ratio of hydrogen is to The ratio of oxygen is one. So 1:2

32:45 1 Simplest Whole Number Ratio of What are these called elements? Empirical Formula. So sir what is the molecular formula It happens? You please look carefully. Now this See. Look carefully. Now you will say sir these two are different There are elements. I would say no to both of these There are beans. This is what I wrote below It is written below. it its It is the molecular formula. what about this? Molecular Formula. Sir what is this? molecular formula is this the formula which contains this Actual number of elements in a in a

33:30 Volume. If inside a molecule The same number of atoms it has. Hydrogen has 12, oxygen has six. what are you saying? actual number of atoms I am telling you. Did you understand it? and this is what Simplify it. Now simplify it. 6 * 1 6 * 2 6 * 1 So see what happened? 1:2 1 What happened? It became an empirical formula. Simplest Ratio in Empirical Formula Of elements are in a compound. One The elements given in the compound what should I do? Simplify it. will become What? Is it clear now? will become imperial

34:16 Formula. Let me give you one more example. Yes. Is this cleared up? Gives one more example See. Yes. Look at this on the screen From. I said this is the numerical that will come out which I I am doing numerical. the type of which I am getting the numericals done. This is the board's The question papers are numerical. Yes, I have taken the sample papers from our sample papers. It has been given to you. Solved is given. That's why please look carefully. Ok? Yes. I will write to you what I was saying. Let's see. C H2O C HOO Now what did I do? a weird one Made the formula. Yes. CHO became CHO

35:03 Gave. Ok? Now this is the formula, this Let's simplify the formula a bit. Count the carbons, how many are in it? Carbon is inside it. did you see? Hydrogen Count how many are inside it? How much hydrogen is there in it? Two. How many atoms of hydrogen are there? Two. How much are oxygen? Look carefully. two more Two. How much oxygen is there? Four. so what is this Is? Is. This is a molecular formula. The compound is represented by a molecular Formula. So this is its molecular Formula. Now I want to make it empirical Formula. Yes, I will change it. In this Let's see if there is any common ratio?

35:48 That is, any number which divides all three Can do. yes brother there are two, right? So all three can simplify it. 2 * 1 2 * 1 and 2 * 2 then you will see that its formula is will be CHO2 What is this CHO2? this is it this is ours Our empirical formula. I understood the point Went? Is the empirical formula clear? Yes I am the one you are just watching. not true If you are a superstar, you will not make this mistake Because this is not a chapter to be seen Is. Will put it together. yes with me Apply. I'm telling you your Your confidence will be boosted. and howsoever Questions came, what are you trying to put on

36:34 will you go? You will be ready. yes yes see There is no chapter about that. please please please Take a notebook, take a pen and do whatever I can I am on the board. yes whatever you understand it's coming write write. in your memory Will go. Your memory will be strong. and when If my every voice comes in the exam You will hear it. Yes, I am right. You will also hear the voice of Sir Tarun Rupani It will resonate inside you. yes, if my If you are a true follower then you can do it whenever you want Give it a try. Try it and see. I I am saying it with great confidence that Superstars. You guys gave me confidence

37:20 I read this sir what is the answer If that concept exists, you will remember that thing and went to many coachings and many No need to search all of YouTube because sir tarun paani is for you It is available. yes it is available and that too It should have happened, but everything is free. Yes It's free. Remember this. take advantage of your

44:08 If we divide the first one then one is coming Is. First one came dividing the forest. now 7 / 1.91 If you divide this then you will get your answer after dividing by 3.6 yes 3.6 and in the last 4.37 4.37 / 1.91 So what happens now? his turn is coming again The decimal point is 2.28 Now you will think that Sir, there is no one in this also not in the hole number then you have to check the hole number What would it take to make one You will have to multiply by a common factor Is it correct to multiply by a common factor?

44:54 You will have to multiply it by some such number what will this decimal number become yes hole there may be a change in the number, like if you Look what is there in these three - here, here and here is the number that comes out after dividing If we divide 2.28 of that by four If we multiply it by four, If you do this then it will be converted into whole number what will happen what will change Whole number is ok convert to whole number The hole will be converted into a hole number If it is in the number then you multiply it, yes why did you do it with four sir and not with two if 3.5 was written here then I would have gone to 2 he did it because I could see it What is three? It is coming in decimal. And What is the plan? What should I do with this? Have to change to nearest hole number. So

45:41 Look at the divide and multiply result here Gone are the fours. Here you will get the result after multiplying it 14.4.4 I will ignore it. yes no more than five Should be. If there is more than five then hole I will take the next number. and look here What? 4:14 Went? Just look carefully. Simplest

46:36 So what is this? this is my empirical Formula. Sir, what will happen with this? If you understand the empirical formula. Listen to what I say carefully. Empirical 14 * 1, why 1? Here it is. and last

50:11 Bye 2 Now whatever answer comes will be C8 H28 O18 this is our molecular formula. Now Did you understand? until as long as the empirical molecular formula will not come out The formula will not come out, jokes apart from this This means that you first use the empirical formula We will extract the empirical from the empirical formula Weight will come from the common factor of empirical weight What will come to find the common factor will do molecular weight or mass upon We will do the empirical wait and now we will get to n will you multiply it empirically Will you get your answer from the formula? I want everything that is written on this screen You? These are the formulas written on the screen

50:58 Yes, do you want everything? Is this what you are saying? Yes Yes. Tell me quickly. do you want that we asked the question on the screen yes, these formulas that are written, all these Do you want it? Yes. Don't worry. To you already what are we going to do? After the classes I will share this. so in this way Empirical Weight and Molecular Empirical We also know the formula and molecular formula You can take it out. Is it clear? Even Is it clear in this chapter? Let's move forward now Let's go quickly. yes let me take you further Quickly, what is next in the topic? Hmm hmm. Let go You just saw the empirical weight, empirical Formula, molecular formula. Now you go

51:43 have been. Coming back to the topic of moles about. So if we talk about someone's value Let's do it and I have to find the number of moles. What to remove? The number of moles has to be found out. Listen to what I say carefully. If I If I want to find out someone's number of moles then I what should I do? So I told you I I will give you ninja technique. What will I give? Ninja Technique. Ninja to remove number of moles Technique. Yes, yes. number of moles of any If you have to find out the number of moles then what will you do do? Pay attention to this technique. These It will help you a lot. whenever question comes He will ask you what is the number of moles? When If he asks then this is what you have to do. What is the plan To you? What is given mass to you? You have been given a mass

52:33 It has to be done by relative molecular mass. Please pay attention. if mass if given mass to you Meaning if any element or any compound If you are given mass then its relative Please divide it by the molecular mass. What is relative molecular mass or grams Molecular mass? g relative molecular Mass is measured in amu and grams Molecular mass is measured in grams Is. Did you understand the point? Yes. That is all There is a difference. So divide it. given sir this Given Mass. hey mass must have been given in the question Brother. Did you understand? So the grievous mass is divided by the relative molecular mass and either given volume may give you volume If you have not given the mass then what should you do? will have the given volume divided by molar

53:21 Volume sir what is the molar volume I told you what the molar volume is 22 Remember the volume is fixed at 4 litres What is the molar volume of 22.4 liters if liters If you are majoring in then 22.4 litres is fixed Is. Volume of any gas at STP It is fixed. Yes, this is mentioned in Agadros Law I told you what is the volume of gases, right? Are they there? are fixed. So 22.4 liters Is. And if this is in centimetre or liter instead of litre If it is in milliliters then its value is 22400 It will be done. Well there's another one what is it? Given Number of particles. What? given number of

54:07 particles or atoms divided by the The Avogadro's number. did i write Aogdros Number Sir, what is this Agadro number? What is Agadro number? 6.022 * 10 to the power 23 particles. In any gas, any substance, its How many particles are there in one mole? 6.022 * 10 to the power 23 whether it's atoms, Be it molecules or ions. Everyone is just this much. It is fixed. Ok? Who told you this? By Agadro. that's why Its name is Aogdross number. So these three You will need the values. Whenever the mole

54:53 We will extract it, whenever we extract the price, then this One of the following formulas will be used. Ok? If mass is given then you can divide the given mass We will do it based on its relative molecular mass. Ok? Now let us ask you this type of question I will show you. The type that I have seen Formulas are given. this is your syllabus There are also formulations. Ok? Let's have a Yes, I have explained the calculation here. Is. Here is that calculation. what do you right now do? We will also ask questions based on this. Now let us take you to the questions. Let this be the first question coming on the screen and I will request a call if I feel Sir it is very easy. Sir what are you talking about Sir? You can ask this question in a jiffy I will take it. So let's ask the questions in a jiffy Are. Let's see. you're asking the question first

55:39 yes. yes my superstars your answer Who is coming first or mine is coming. Let's go together I apply it in. Let's see who gets it first Is. Are you ready? Yes. my superstars Always ready for the challenge. yes My dear superstars come let's play Along with me and you questions. Let's go to this You need the gaysex law in question Will need it. What are you giving in the question? is giving 20 cm Cube of methane. then you get methane I told you the volume. How do you know this Sir? shows you the mass given the volume have you given it? See if it is written in grams, If it is written in kilograms then it is obvious Isn't it mass? And if it's written centimetre, written in milliliters written in liters So is the volume. Did you understand it? So you

56:26 Who has given the volume? of methane. These remaining methane. Now I told you about the gas Don't worry about the equation. Equation Given Is. So you see it here The equation is balanced. this equation is balanced Is. Here it is clearly visible that methane What is the volume of? One Volume. Forest Volume. This is the volume of methane 1 Volume. And it is written two in front of chlorine. Is. So this is volume two. And see this next It is dichloromethane. Here is the CH2Cl2 dye Chloromethane. Its volume is nothing. The numbers are given ahead. So it means forest Volume. And last is HCL. How many Is volume given? In its volume How much is given? Write in simple ratio Should I give it? Its volume is given again to.

57:13 Here's number two. So you have all the gases I wrote the volume of it. yes it is written then Means it is gases. because I said so Gassex Law applies to liquids and solids Does not happen. So now look at what you have Is? You have the volume of methane 20 cm Here it is. The volume of methane you I have a given. what are you asking? what is The volume of HCL here? Whose volume Are you asking? Its. Asking about HCL. Volume of HCL. so how do you get started do? See here start with given do. Always start with given. And what is given? Given is methane. is given Methane. So you will write from here Molecule or one mole. one volume of

58:01 Methane. One volume of methane. what is methane is ch4 does it? what are the products Is there methane? is producing two Volume of HCL. this is what the question is about In. one volume of methane The volume of HCL is producing. These So it is clear. So now the value of one volume How much is it? One volume of methane. Forest The value of volume of methane given is 20 Cm. If the value of a volume is 20 so how much will be two? why two Are you taking it out? Because the value of HCL How much is it? Two. that's why you are taking out two Are. So why did you take out two? because HCl

58:49 It was written 'Too' in front of '. then what is the value of two will it be? Hey brother when an ice cream is for ₹20 So how much will two ice creams cost? ₹40 It will be. It's simple. This is the unitary method. two only Why are you taking it out? I said no to this what is written next? Two. Hence two volumes. So the answer for 2*20 is 40 cm it's clear it's absolutely clear so you'll know Find the volume of HCL is 40 cm3 Yes, how many superstars are they bringing out start checking it soon Check how many superstars are being eliminated Let's quickly watch my superstars How many of you asked me to answer this?

59:34 It has been written earlier. how many wrote it down Was? 40 cm yes my dear superstars If it is written please tell me quickly. Let's see it soon. Let's move ahead. next I am asking the question on the screen. Yes, yes I told you about the mole concept chapter today I will finish it. Very simple and that question I will tell you whatever is coming in your board. Yes, please pay attention. Please pay attention. focus here because when you are together You are putting it on, you are sitting live with me By understanding this concept, you will get a lot of benefits. You will get advantage. Yes, I am telling the truth. After this you will not have to work hard If you have put it here then. Let's ask this question Look at the . See what you just had? Gases

1:00:19 You gave the equation of and you used Gale Luceaux Law Have put. This is what I told you. Now you are in it See. Look again. It is written here in CERTAIN REACTION 5 LITERS OF OXYGEN SORRY 5 Liter of Hydrogen Reacts with 4.2 liters of chlorine. Good Hydrogen and chlorine are reacting And they are producing a gas. Here it is I wrote the reaction for you. I I have written the reaction for you. will be given Reaction. There is no need to take tension. It is clearly visible. 1 of hydrogen There is volume. Hydrogen has one volume. of chlorine There is One Volume. and both produce together Doing two volumes of HCL. Ok?

1:01:05 What is in the question? When you get two together Give it volume. please listen carefully Take this topic. before that same one Gave volume. yes, the one before that There was a question about only one gas in it Gave volume. It was of methane. So when two gives the volume of the gases, you can calculate its One should check which gas has one volume She is the youngest one. What? listen to me again To the point. Yes, it has given two volumes. Where have you given it? A lamp contains 5 litres of hydrogen. One is 5 liters of hydrogen and the other is 4.8 Liter of ox chlorine. Isn't it? So when you If you are given two volumes then the first thing you need to do is I want to check whose one volume is smaller?

1:01:54 then you will see that one volume of chlorine is smaller Is. What is one volume of chlorine? Less Is. It is small. Pay a lot of attention. very clearful Please take it. One volume of chlorine is small So the one which has smaller volume is called Yes, there are. What to check? please again Listen. Two volumes are given. of hydrogen as well Volume is given. volume of chlorine also given Is. So what do we have to check for both of them? Whose One volume is small? so in my case one volume of hydrogen sorry one volume of Chlorine is small. 4.8 pie is smaller From. So that is why it is called limiting. Reagents. What do you call this? Limiting Reagents. sir limiting reagent a reagent Which get used up in the reaction. In other words

1:02:40 What will happen if chlorine is completely absorbed? this reaction I will burn completely, it will be used up Will go. Is it clear? Are you getting the point? What will happen to chlorine in this reaction? It will be completely used up and will be finished It will go away and will be exhausted. That's why to what do you say? limiting reagent. So Chlorine is small. Did you understand it? What checks Had to do it? I got your answer. which is The Limiting Reagent? So your answer should be Chlorine is the limiting reagent. Now You have to start the answer from this. From this don't start it. Your answer starts with this Will not done. Yes, you understood the technique? Ninja Did you understand the technique? two by two one by one Volume is given, right? Chlorine was also given Yes, it is a lamp of hydrogen. So who are we to start? So I said you start

1:03:26 You will do it with the chlorine one. Why? Because its one volume, its one volume small Is. You will start from here. how will you write that one volume of chlorine Is equal to one volume of hydrogen. This means one volume of hydrogen How much will it be? Why 4.8? Because the forest Volume of chlorine in water is 4.8 Liter. Theref what will happen to this? Forest The volume of hydrogen will become. So you I saw that the volume of hydrogen is 5 liters It is written. yes bro so that means full 5 Liters of hydrogen are not being consumed.

1:04:13 Hydrogen is not getting completely exhausted. How much hydrogen is being used? It's only getting 4.8 liters. So the remaining 2 Liter. Yes. How much will you get after subtracting is?2 Liter. This is remaining hydrogen. these are yours What have you passed? this is the hydrogen Who has survived. Remaining Uncombined There is hydrogen. and if he asks me What is the volume of HCl? So we again What to do? We will use this again. will write one volume of chlorine Produces Two volumes. 2 volume of HCL and now

1:05:01 Agar Value of One Volume of Chlorine Agar The value is 4.8. yes it is 4.8 so to key What will be the value? why are you taking out two Are? Because what is the value of HCL? Two There is volume. It is double. So double it. So 2 volume of chlorine will be 4.8 * 2 When you multiply you will get your answer 9.6 litres. So it is clear that how much HCL is there will be? 9.6 litres. yes, if I ask you What is the what is the balance? what is The Balance? what is left over Hydrogen? then your answer would have been that left

1:05:48 How much is over hydrogen? 2 litres. Do you understand now? because I've It was said that chlorine gets completely burnt in it will go. chlorine is the limiting reagent in Is. Sir how to find out? how did you know Did? I said when I gave two volumes It will be. See the first volume five litres. The second volume is 4.8 liters. So when the two volumes If you ever need gases then you need both You will have to release one volume at a time. What Need to remove? One Volume. so 1 volume of Hydrogen 5 Litres. one volume of Chlorine 4.8 One Volume of Both. Ahead Look, there is one, there is one. Yes. There is no number So how much is a molecule? Forest. so its one one Which one is smaller in volume? So I said that whatever small number one volume will be the same

1:06:35 What will be my chemical, my element? would be the limiting reagent. in this case Chlorine is my limiting reagent. talk Did you understand it? The limiting agent is that Whose one volume will be smaller. when two This should be done only if volume is given. When one If the volume is given then there is no need to do this There is no need. Did you understand the point? From this In the first one, the methane one, I did this did not do. Did you understand it? Let us go Now let's move ahead. You also read this numerical I understood it. Yes. If you planted me before It is a big like to you. Let's look at this question Let's do it. Look carefully. this question What's coming in? a student collects 5 liter of oxygen, 2 liters of hydrogen and 6 liters of nitrogen.

1:07:20 what did you tell me? I told you everyone's numbers. Did you see it? I told everyone's number. what you from Are you asking? asking which will have given greatest number of greatest number of Molecules? So we discussed it with you what was the definition in the Agadros Law of Agadro's Law? Tell me quickly. Aogdros Law I discussed with you that Agadro The law says equal volume of gases. If the volume is equal. Listen carefully. If volume is equal then number off The molecules are equal. But you look at it The volume is not equal. Look carefully

1:08:07 The volume is not equal. I understood the point Is? So you need to find out what it is Thing? that if the volume is not equal then now Finding the number of each gas Is. Like first let's talk about 5 liters off Oxygen. What do you want to know? 5 liters of oxygen. And what is written? under same temperature and Pressure. Look at this carefully. you this It has been found that the volume of oxygen How much is it? 5 litres. So 1 Listen carefully. 1 mole Off Oxygen How many liters in 1 mole of oxygen

1:08:55 will be? you will answer sir 1 mole of oxygen in 22.4 It will be litres. Is it fixed? Yes. 1 in 1 mole mole of any gas any gas its This is the volume. Are you getting the point? And How many number of atoms in 1 mole of oxygen Will it be? So your answer will be 6.022 6.022 * 10 to the power 23 is what? So much The number of atoms or molecules will be Or there will be ions. This was the rule. this is what was told No, you have the basic rule that one mole of anyone. Now you know its 22 liters

1:09:42 that there is this much in 22 litres then there is this much in 5 litres How much will it be? Yes, do you understand now? If 22.6 Liters of oxygen contain 6.022 10 to the power 23 molecules. So how many will be there in 1 litre? in 1 liter 6.022 * 10 to the power 23 divided by 22.4 And how much will it be in 5 liters? In 5 liters How much will it be? When in 1 liter of oxygen this If the value is coming then it is more in 5 liters will come. So what will you do with it? to this

1:10:27 What to do in the next step multiply by Will you give it? into 5 so what you need is simply want to do it? Now anyone can have anyone's number Will have to take it out. What will you do in this case? 6.022 * 10 to the power 23 bye 22.4 into if you want to extract hydrogen Turn it into two. You need to take it out Please turn nitrogen into six. because nitrogen listen carefully Because the volume of nitrogen is the highest so that's why the maximum number of The molecules will be in nitrogen. Your Which has the highest number of molecules? Will it be? In nitrogen. and the lowest number Who has the smallest number? The smallest number

1:11:14 is two and the smallest number is two is hydrogen Of. so the least number of molecules will be in hydrogen. Is it clear? Here the understanding did I come? Yes, it did cost me a bit of brain. What do you say? A bit of brain work was done. Isn't it? You had to think a bit about that What do I have to do? What do you say? Yes. Expect such questions. This type of Expect questions. Why? I say I always expect the unexpected. Haven't you heard it? Yes. always expect that What has not happened will happen to you. I am yours I am telling you right now what you are thinking yes it won't happen and what you didn't think will happen It will happen to you. yes remember this To. so if you're ready for that now

1:12:02 If you are ready for it then you There is no need for tension. if you are Prepared for the worst if you get the worst If you are ready for it then there is nothing wrong with you I can do it. Yep, never heard of that. Yes, pay attention. What? You be ready. Whatever happens, I am ready. Let go Calculate the molecular weight of sulfuric Acid. to find out the molecular weight of sulfuric acid. oh oh I didn't give anything Is. So what do you simply have to do? If I need to find out someone's molecular weight. If We need to find out the gram molecular weight. Attention Listen to it from. What? only molecular here Wait is written. And I'm saying if you It will say gram molecular mass or weight Have to take it out. then you will get sulfuric acid Don't worry. Its elements are explained

1:12:48 Will be. The formula of sulfuric acid is H2SO4 So how much is hydrogen? There are two atoms. So You will get 2 * atomic Weight of hydrogen. saw? two of the hydrogen is the atomic weight. so that's why do two into I will give. Sulphur S There is only one sulphur. appear It has been clear. So what will you do? What is the atomic weight of sulfur? You should not take tension. Given in Question It will be 32. Yes. What else is there? What is in the last? look and in the last

1:13:40 Not there. It must be given on the board. So you get 2 and here it will be 4*16 now you three 98 am If you wrote amu then the answer would be If we have to calculate it in molecular mass then it is 98 grams

1:14:48 Ninja technique app. Yes. what did you ask? Do it. The formula for number of moles is a very It is simple and that is given mass

1:15:37 yes * 10 to the power 23 so in our case this is This and both of these will be applicable it will not happen because what is given here Is? The mass is given. See it is written gram Neither mass is given. of Volume You will not be able to apply the formula. and you get carbon Relative molecular mass of dioxide You should know how to take it out. or gram molecular mass gm of carbon dioxide carbon What is carbon made of? C1 is the carbon The atomic weight is 12. atomic of oxygen Weight is 16. So why 16*2? Because How many atoms of carbon are there? Two. So now you Please plus it. 12 + 32 has come to you 44 Gram. What did we throw out? Gram

1:16:22 Molecular mass. yes bro in answer gram Write it down. Work is done. if the mass of elements are measured in grams it becomes grams Molecular mass. Ok? then your gram Molecular mass came to 44. Divide By The formula for number of moles was given mass. What is the given mass? See 132 132

1:17:09 Give. Don't miss it. yes you will miss it No one else will tell you. I am telling the truth. Everybody must be coming. and what about thinking this

1:21:50 Numbers may vary but follow the same pattern There will be questions. Did you understand the point? Let us clear the concept of vapor density Went. Let's move forward and you will I give you questions. Here is the calculation Percentage composition. This seems to me to be This is the most important topic of the chapter. To all It is an easy topic. What? I am saying most It is an easy topic. Sir percentage composition. See if you want to calculate percentage of anyone What? If you want to calculate percentage of anyone then Percentage of element of whichever element If you want to find out percentage, keep it on top. What will you do it? atomic weight You will put the off element on top Upon

1:22:37 You will write down the complete relative molecular mass * Will you make it 100? So whenever you calculate the percentage Whoever wants to take out the percentage, you will make these 100 times more of his own mass You will put the total mass of that element on top you will keep it down you will keep it down the total mass of the molecule Divide by 100 by 100 Let's see what is asked in our case what is asked calculate the percentage composition of various elements means as many There are elements for everyone, I asked about one of them I am not asking, I can ask specifically is saying the name of an element Various elements. So what do we get out Is? First, remove the calcium carbonate I have been. Here is a look at calcium carbonate

1:23:23 CaCO3 What is the atomic weight of calcium? Given Is. 40 I already told you. do you remember You should not do it. so how much of 40 plus carbon Is? How much is 12 plus oxygen? 16 * 3 Why three? because in oxygen it is written O3 Is. So 16 * 3 What did you get? 40 + 12 + 48 AA It will take 100 grams. what did you take out Gave? gram molecular mass of the whole Compound. You have used calcium carbonate completely The mass was removed. It is calculated in grams. That's why I said gram molecular mass. If you calculate it in amu then its name will be This will be the relative molecule. same thing 100

1:24:10 amu will become relative at molecular mass. Is it clear? Did you understand this much? Now We have to extract each and every element. First This is the percentage of calcium. First Element Who is it? Calcium. So what will you do? Atomic Will keep the weight of calcium up. Upon Grams will keep the molecular mass down * 100 means whatever percentage you want to calculate Let's keep its atomic weight on top. total Let's keep the weight down into 100 like ours It is happening in the case. In our case Mass of calcium is given as 40 / 100 * 100 who is this 100 for? the one below What is the molecular mass of a gram of a denoter?

1:24:55 Because of. It is because of this. This village 100 below because of the molecular mass and this Where did 100 come from? because the percentage I have to find out because what is our answer Do you want me? I want it in percentage. that's why Multiply by 100, so solve it now. Your answer has come, you also got 40%. Now similarly calcium is extracted. Now the next It will be made of carbon. Percentage of Carbon Beans will do. atomic weight of carbon above I will keep it. We will keep the total weight down. * 100 yours Percentage of carbon will come and last Percentage of oxygen. The mass of oxygen is 48 / 100 * 100 and your answer will be 48%.

1:25:42 So you have got the mass of all three. keep this in mind Percentage of Total Percentage of Total Will Always be 100%. Yes. Now you add these three Do it. 40 + 12 + 48 adds up to 100 Used to be. Are you getting the point? Only We are not talking about carbon or calcium carbonate. have been. Percentage of any element composition of all elements will be equal to 100. Ok? Let's move ahead. this is clear Is. It's simple. Come. what is written? The Molecular formula of carbohydrate. what is written here? Off carbohydrates. Off Carbohydrates What is the empirical formula? You have a

1:26:29 The element is given. yes, a little formula I will write it down. You need to know its molecular The formula is given. Molecular The formula is given. Look carefully. So C6 is given H12 Yes, I wrote it above. It will happen like this. C6 H12 O6 Yes, it is a typing error. Don't worry. Yes, I already told you this. This is a is the molecular formula and the molecular Actual number of elements in the formula These give a compound. this is the six There are atoms of carbon. These are 12 hydrogen atoms There are atoms and there are six oxygen atoms. So the actual number of atoms when somewhere If it is written in compound then we call it

1:27:14 People call it molecular formula. and simplify the molecular formula Two. Look, there is a common factor that unites all three It is dividing. There is a number that He is simplifying all three. yes one what is number six? yes yes look at this All three are divisible by number six have been. So you divide it by six. 6 * 1 6 * 2 6 * 1 so now you have The formula is CH2O What has happened to this? It became the simplest Ratio of elements in a compound. So when We will make the simplest ratio, after this and If you can't simplify it, then its name is There will be an empirical formula. If you have watched from the beginning, you

1:28:02 Starting from today you are in the live session, I I can tell you this question with certainty You must have done it before me. what do you say Are they my superstars? And I am able to see Am. Many superstars answered I am writing dhana dhan de dhana dhan. yes, I I see us here On the screen. Yes, the answer of superstars He is coming before me. Yes, if you have You must have seen the lesson from the beginning today, live If you have seen the video then your answers are coming Will be. yes let me see now that you Who is answering before me? a big Like I will definitely give a shout out to those who My superstars did it before me have been. That's why I told you not to miss this chapter do it because this chapter is so detailed No one is explaining me. yes true

1:28:48 I am telling you. and very simple language It feels exactly like butter in it This chapter. Come on, I asked some more questions Only these types will come. Let's calculate the empirical mass of the CH 2O Empirical mass has to be found. Empirical Empirical mass can be determined from the formula Is. Empirical Mass from Empirical Formula Can be removed. What do you have? This is an empirical formula. It is visible Clearly. Ok? C H2O What is C Carbon 12 H? Hydrogen * 2 and What is O? oxygen 16 atomic of three

1:29:34 I added the weight. You got your answer 12+ 2 How much is 14 + 16? 30 because now If you have written the answer in this, then amu This answer is in atomic mass units. Understand the point Are you coming in? Is it becoming clear till here? Yes. How many superstars have been eliminated before? Gave? If I see it, I will quickly say his name I want to take it.

1:30:32 Shreyaji Chaki 30g absolute is correct. Arnav Patil 30 30 30 Yes 30 Many many superstars Karthik what we have discussed with you, the kind of I copied the questions from the board

1:33:10 Now we will find the atomic weight of sulphuric acid mass of hydrogen into number of atoms and then

1:34:41 Did you read that if 5 hens lay 10 eggs If she gives eggs then how many eggs will a hen lay? Did you remember? Did you remember? Yes. You used the unitary method I did not do maths. Will have to put it here. Look, whose mass do we have to remove? of sulfuric acid. We have to remove the mass. Just listen carefully. the value of which has to be found out, whose value We need to calculate it, let's do it On the right hand side. What? let's do that on the right hand side and what is given It is written on the left hand side. What do we have given? we have given Is of magnesium. So we'll write it as 24 grams. of Magnesium Produces No produces no reacts. He is not producing. I am reacting Is. Reacts With Reacts With

1:35:29 196 g of HCl of sulfuric acid. Correct Is? That's it. So I said what is given The left side is what we need to find. We have to find sulfuric acid. So This on the right hand side. then 1 gram

1:37:07 Sulfur dioxide. You get sulfur dioxide It has happened. We know that sulphur is produced at STP I told you that the volume at STP is fixed.

1:37:57 There is a given in the question. so 60 grams off 56

1:39:37 I am with you. just remember you