Mole Concept
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- Опубликовано: 22 янв 2018
- Do you know how much is 1 mole? Mole Concept is explained in terms of mass, count of particles and volume of a gas.
Avogadro's Number also known as Avogadro's Constant is also explained. Mole is a very important unit in Chemistry.
Solutions of Top 3 Questions on Mole Concept: COMING SOON !!
The questions are shown at the end of the video.
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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
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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
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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.
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At 2 ans volume must be 5 times 22.4 litres = 112 litres. Btw thanks for helping me out in other answers.
Finally after many years I got cleared on the mole concept... Thanks a lot
You are most welcome
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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
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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 ❤
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Sir ne volume of gas puchi thi or gas N² hoti na ki N😅😅😅
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MOLE CONCEPT....
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VIDEO VERY WELL PLANNED AND EXECUTED.
Vatsa BANGALORE
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