SO2 and CO2 are two gases kept at STP.
a) What is the volume of 1 mole gas at STP?
b) If the volume of CO2 and SO2are l l 2L each, (i) Find out the number of moles of CO2•
(ii) How many molecules are present in SO2?
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Answer:
At STP, 22.4 liters of a gas forms one mole that is 6.023×10
23
molecules.
Volume of CO
2
in 1 litre of air =
100
0.03
×1 L
∴ No. of molecules of CO
2
=
22.4
6.023×10
23
×
100
0.03
=8.066×10
18
I) Moles of CO
2
=
44
4.4
=0.1 mole
Number of oxygen atoms=2×moles of CO
2
×N
A
=0.2N
A
=1.2×10
23
atoms
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