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Question

A gas has a density of 3 g/L at S.T.P. What is its molar mass?

A
67.2 g
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B
40 g
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C
20.4 g
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D
10 g
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Solution

The correct option is A 67.2 g
We know,
PM=ρRT
where,
M= Molar mass
ρ= Density of gas
At STP;
T=273 K,R=0.0821 atm-LK-mol
P=1 atm
M=ρRTP=3×0.0821×2731
M=67.2 g

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