Answers: Q1. Molecular Formula of Ammonium Carbonate => (NH₄)₂CO₃ N₂ → 14 × 2 = 28 2H₄ → 1 × 2 × 4 = 8 C → 12 O₃ → 16 × 3 = 48 ---> 28 + 8 + 12 + 48 = 96 Therefore, Molar Mass of Ammonium Carbonate is equal to 96 units and it's expressed as 96g/mol __________________________________________________________________________________________ Q2. Molecular Nitrogen consists of 2 Nitrogen Atoms and is denoted as N₂ Molecular Mass → 28 Molar mass of nitrogen gas → 28g/mol We know, that per mole of nitrogen gas, there are 28 grams of it. So, let the number of moles be x 28x = 140 x = 140/28 = 5 Thus, there are 5 moles in 140g of Nitrogen Gas STP is Standard Temperature and Pressure. According to IUPAC Definition, (Which is usually used by chemists) STP is 273.15K and 10⁵ Pa. Volume of any gas at STP is 22.4L ( Standard Molar Volume ) Thus, Nitrogen's volume at STP is 22.4L __________________________________________________________________________________________ Q3. The molecular weight of water is 18 g/mol. Hence, one mole of water weighs 18 g. One mole of water contains 6.023×10^23 (Avogadro's Constant) water molecules. Mass of one water molecule = 18/(6.023×10^23) 2.988 × 10^-23 g Since this is in C.G.S. unit, we need to convert it into S.I. unit S.I. unit of mass is Kg 2.988 × 10^-23 g ==> 2.988 × 10^-26 kg [ SINCE 1 x 10^0 g = 1 x 10^-3 kg ] 2.988 × 10^-26 kg ==> Answer. __________________________________________________________________________________________
Great to hear that the concept is clear to you :) Thanks!! To revise the concepts, try the Quiz and Top 3 Questions for this video here: www.manochaacademy.com/chemistry/mole-concept/l/mole-concept
I have always had a doubt in mole concept. I have watched tons of videos to clear my problems but none of them helped until I came across this video. Thank you so much for clearing my doubts. When I first came across this topic , my mind was deluded in confusion. Most of the teachers offline or online blindly just state the avagadro's number and tell us to remember it. But this is the first time I came across someone who practically showed us how and why it is the way it is. On behalf of all students, we are really thankful for the all the contents you come up with.
Im a house wife of 47 years. I did chem hons . I forgot many things in chmistry. I subscribed ur channel to learn chem again. Thanx for explainig in such a good way
In a simple and easy manner, you explained this tough topic and I understood fully. A lot of vedios I have already gone through but couldn't understand. A great and unique teacher amongst you tuber. Thanks alot. A Great, great, great teacher with great and valuable knowledge.
MOLE CONCEPT.... SIR, YOU EXPLAIN MANY COMPLEX THINGS IN A SIMPE WAY TO MAKE UNDERSTAND THE CONCEPT. AMONGST ALL, THIS VIDEO STANDS IN THE FOREFRONT. NO DOUBT YOU HAVE A KNACK OR SPECIAL QUALITY FOR TEACHING. IN MY OPINION, THIS VIDEO IS OUTSTANDING IN EXPLAINING THE CONCEPT AND A WORLD CLASS ONE WORTH PRESERVING FOR DEMONSTRATION IN ALL SCHOOLS AND COLLEGES. AS PER MY EXPERIENCE MANY BOOKS AND TEACHERS/LECTURERS HAVE MISERABLY FAILED IN THE PAST AND PRESENT TO EXPLAIN THE CONCEPT. VIDEO VERY WELL PLANNED AND EXECUTED. Vatsa BANGALORE
sir before watching your this video of mole concept I watched many video but I unable to understood any of those and at last I watched your video and now my mole concept is clear. So thnx at lot sir....
Tomorrow is my physics exam and I dont know what to do , and i searched your channel and read the mole concept ! Now I understood ! thank you so much sir !
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Sir, you have taught this so wonderfully that now the concept is clear.No one else has been able to explain this earlier,so beautifully and with so much clarity.Thankyou Sir!!
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Finally after many years I got cleared on the mole concept... Thanks a lot
You are most welcome
@@ManochaAcademy Sir, solutions ?
Ope oooooo.
His village people don japa
Other channels weren't showing how to even solve it
Answers:
Q1. Molecular Formula of Ammonium Carbonate => (NH₄)₂CO₃
N₂ → 14 × 2 = 28
2H₄ → 1 × 2 × 4 = 8
C → 12
O₃ → 16 × 3 = 48
---> 28 + 8 + 12 + 48 = 96
Therefore, Molar Mass of Ammonium Carbonate is equal to 96 units and it's expressed as 96g/mol
__________________________________________________________________________________________
Q2. Molecular Nitrogen consists of 2 Nitrogen Atoms and is denoted as N₂
Molecular Mass → 28
Molar mass of nitrogen gas → 28g/mol
We know, that per mole of nitrogen gas, there are 28 grams of it.
So, let the number of moles be x
28x = 140
x = 140/28 = 5
Thus, there are 5 moles in 140g of Nitrogen Gas
STP is Standard Temperature and Pressure.
According to IUPAC Definition, (Which is usually used by chemists) STP is 273.15K and 10⁵ Pa.
Volume of any gas at STP is 22.4L ( Standard Molar Volume )
Thus, Nitrogen's volume at STP is 22.4L
__________________________________________________________________________________________
Q3. The molecular weight of water is 18 g/mol.
Hence, one mole of water weighs 18 g.
One mole of water contains 6.023×10^23 (Avogadro's Constant) water molecules.
Mass of one water molecule =
18/(6.023×10^23)
2.988 × 10^-23 g
Since this is in C.G.S. unit, we need to convert it into S.I. unit
S.I. unit of mass is Kg
2.988 × 10^-23 g ==> 2.988 × 10^-26 kg [ SINCE 1 x 10^0 g = 1 x 10^-3 kg ]
2.988 × 10^-26 kg ==> Answer.
__________________________________________________________________________________________
At 2 ans volume must be 5 times 22.4 litres = 112 litres. Btw thanks for helping me out in other answers.
...people was very confused when I started to buy stuffs in moles, man you're a master of chemistry🤜🤛
if teachers taught us like that, I would have been so interested in studies
Thanks for liking
@@ManochaAcademy no responses to me 😢
Ye
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Yes😅
Yea
Yess
August 😊
Fr
The production quality of the video and the fluency in communication is outstanding...
Thanks for liking
Amazing,i really understood this concept,with which i ws messed up since 2 days
Great !!!
The lessons are very good but improve in your linking directions
Out standing sir, first time i understand the concept of mole realy
Great to hear that the concept is clear to you :) Thanks!!
To revise the concepts, try the Quiz and Top 3 Questions for this video here: www.manochaacademy.com/chemistry/mole-concept/l/mole-concept
Me too
Same here
@Ĺ Laiba yeah
Me too sir. I am very greatful to u
Best UA-cam channel for studies
I have always had a doubt in mole concept. I have watched tons of videos to clear my problems but none of them helped until I came across this video. Thank you so much for clearing my doubts. When I first came across this topic , my mind was deluded in confusion. Most of the teachers offline or online blindly just state the avagadro's number and tell us to remember it. But this is the first time I came across someone who practically showed us how and why it is the way it is. On behalf of all students, we are really thankful for the all the contents you come up with.
Im a house wife of 47 years. I did chem hons . I forgot many things in chmistry. I subscribed ur channel to learn chem again. Thanx for explainig in such a good way
One of the best teacher in online...
Thanks
I was totally confused about mole concept later,but after watching this video, I understood the whole concept very easily .
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Answers 1) 96 grams 2)i) 5 moles ii) 112 litres 3) 0.018 kg
Thanks alot sir😄😊
could u explain this?
Unfortunately you are wrong.The answer to question 3 is 2.99 × 10 ^-23 grams.It is the molar mass of H2O divided by Avogadros constant.
@@nathanjohn2572 you could just do the molecular mass number as the mass of 1 mole of water
@@falco2296 No,if you what the video it is infact 1 molecule of water not one mole of water.
Now the concept of mole is totally clear.....😊......Thank you so much dear sir.....💙
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Arnold Arulmurugan
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1) 96 g
2) => Number of moles in 140 g of N2 is 5 moles & volume is 112 L
3) 18 g ❤
Bro agr appko nhi aata to glt kyu bta rhe hoo
Sir ne volume of gas puchi thi or gas N² hoti na ki N😅😅😅
@@gamingkilleryt563 N² nahi, N₂ hota hai. Bro pehle aap to revise kar lo 😅😅😅
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In a simple and easy manner, you explained this tough topic and I understood fully. A lot of vedios I have already gone through but couldn't understand. A great and unique teacher amongst you tuber. Thanks alot. A Great, great, great teacher with great and valuable knowledge.
You are most welcome
Sir no words to appreciate your teaching..extremely helpful.
It's my pleasure
MOLE CONCEPT....
SIR,
YOU EXPLAIN MANY COMPLEX THINGS IN A SIMPE WAY TO MAKE UNDERSTAND THE CONCEPT.
AMONGST ALL, THIS VIDEO STANDS IN THE FOREFRONT.
NO DOUBT YOU HAVE A KNACK OR SPECIAL QUALITY FOR TEACHING.
IN MY OPINION, THIS VIDEO IS OUTSTANDING IN EXPLAINING THE CONCEPT AND A WORLD CLASS ONE WORTH PRESERVING FOR DEMONSTRATION IN ALL SCHOOLS AND COLLEGES.
AS PER MY EXPERIENCE MANY BOOKS AND TEACHERS/LECTURERS HAVE MISERABLY FAILED IN THE PAST AND PRESENT TO EXPLAIN THE CONCEPT.
VIDEO VERY WELL PLANNED AND EXECUTED.
Vatsa BANGALORE
You have the best teaching skills
I appreciate that! Do share with your friends
sir before watching your this video of mole concept I watched many video but I unable to understood any of those and at last I watched your video and now my mole concept is clear. So thnx at lot sir....
This is the perfect explanation ever..
Yes
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Tomorrow is my physics exam and I dont know what to do , and i searched your channel and read the mole concept ! Now I understood ! thank you so much sir !
All the best
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@@ManochaAcademy 🥰
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At first I was very weak at physics and chemistry.
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Answers
1. 96 grams
2. 2.1 - 10 number of molecules
2.2 - 224 litres
3. si unit = kg = 0.018 kg
Very nice session Sir enjoyed a lot
Unfortunately you are wrong.The answer to question 3 is 2.99 × 10 ^-23 grams.It is the molar mass of H2O divided by Avogadros constant.
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