the mass of litre of oxygen at Standard conditions of temperature and pressure is 1.43 gram and that a litre of SO2 is 2.857 gram
(ii) what is the mass in gram of a single molecules of each gas
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CHEMISTRY
The mass of a litre of oxygen at standard conditions of temperature and pressure is 1.43 g and that of a litre of SO
2
is 2.857 g.
(i) How many molecules of each gas are there in this volume?
(ii) What is the mass in grams of a single molecule of each gas?
(iii) What are the molecular masses of SO
2
and O
2
respectively?
December 26, 2019avatar
Aarthi Joon
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ANSWER
1)
At STP , 1 mol of gas = 22.4L
You have 1.0L of each gas . Therefore you have
22.4
1
mol of each gas.
1 mol of anything contains 6.022×10
23
molecules
Therefore you have
22.4
6.022×10
23
molecules of O
2
and SO
2
2)
Oxygen: 2.69×10
22
molecules = 1.43g
1 molecule =
(2.69×10
22
)
1.43
=5.32×10
−23
g
Therefore,
SO
2
1 molecule =
(2.69×10
22
)
2.857
=1.06×10
−22
g
3)
1mol=22.4L at STP
Oxygen ,1.0L=1.43g,22.4L=1.43×22.4=32.0g
SO
2
=1.0L=2.857g,22.4L=2.857×22.4=64.0g
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