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Question

Which of the following gases will have a density of 1.9 g L1 at 1520 torr pressure and 87 C?

A
CO2
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B
N2
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C
O2
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D
SO2
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Solution

The correct option is B N2
Given:
Density, d=1.9 g L1
Pressure of the gas, P=1520 torr=2 atm
T=87 C=360 K
Using density relation of ideal gas equation,
PM=dRT
where M is the molar mass of the gas
M=dRTP=1.9×0.0821×3602=28 g
The gas will be N2.

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