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  4. The density of air is 0.001293 g / cc at STP. Its vapour density is

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Q. The density of air is $0.001293\, g / cc$ at STP. Its vapour density is

AIIMSAIIMS 2007

Solution:

Density $=0.001293 g / cc$ or $1.293\, g / L$
Molecular mass $=\frac{R T d}{P}$
$=\frac{0.0821 \times 273 \times 1.293}{1}$
$=28.98\, g / mol$
Molecular mass $=2 \times$ vapour density
$VD =\frac{28.98}{2}=14.49$