relationship between no. of moles of gas with volume
TRANSCRIPT
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CHAPTER 3 : CHAPTER 3 : CHEMICAL FORMULAE & CHEMICAL FORMULAE &
EQUATIONSEQUATIONS
3.4 The Mole & the Volume 3.4 The Mole & the Volume of Gasof Gas
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MOLAR VOLUME
22.4 dm22.4 dm33 at at STPSTP
(0°C and 1 atm)(0°C and 1 atm)
- volume occupied by 1 - volume occupied by 1
mole of any gasmole of any gas
24 dm24 dm33 at Room at Room Conditions Conditions
(25°C and 1 atm)(25°C and 1 atm)
3.4 The Mole & the Volume of Gas3.4 The Mole & the Volume of Gas
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3.4 The Mole & the Volume of Gas3.4 The Mole & the Volume of Gas
O2 gas
O2 gas
In STP In Room Condition
22.4 22.4 dmdm
33 24 dm 24 dm 33VolumVolume of Oe of O22 = =
VolumVolume of Oe of O22 = =
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GENERALISATION OF GENERALISATION OF MOLAR VOLUME OF MOLAR VOLUME OF
GASESGASES
•1 mole1 mole of any gas always occupies of any gas always occupies
the the samesame volumevolume under the under the same same
temperature and pressure.temperature and pressure.
3.4 The Mole & the Volume of Gas3.4 The Mole & the Volume of Gas
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No. of Moles
Volume of gas (dm3)
x molar volume
molar volume
RELATIONSHIP BETWEEN THE RELATIONSHIP BETWEEN THE NUMBER OF MOLES AND THE MASS NUMBER OF MOLES AND THE MASS
OF A SUBSTANCEOF A SUBSTANCE
3.4 The Mole & the Volume of Gas3.4 The Mole & the Volume of Gas
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Examples:
Calculate the volume of 0.075 mol of carbon dioxide gas measured at STP
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Find the number of moles of 4800 cm³of ammonia gas at room conditions
Try to find:
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3.4 The Mole & the Volume of Gas3.4 The Mole & the Volume of Gas
No. of Moles
Volume of gas (dm3)
Mass (g)
x molar massNo. of
Particles
x NA
NA
molar x
volume
molar volume
molar mass
P/S:Number of moles act as an intermediate
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No. of moles
=Mass (g)
Molar mass (Ar or Mr)
No. of moles
=Volume (dm3)
Molar volume (STP=22.4 dm3 mol-1 or
Room=24 dm3 mol-1)
No. of particles
=No. of moles x NA