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Chemistry Question on Ideal gas equation

The density of air is 0.001293 g/cc0.001293\, g / cc at STP. Its vapour density is

A

0.001293

B

8.2786

C

14.49

D

6.2706

Answer

14.49

Explanation

Solution

Density =0.001293g/cc=0.001293 g / cc or 1.293 g/L1.293\, g / L Molecular mass =RTdP=\frac{R T d}{P} =0.0821×273×1.2931=\frac{0.0821 \times 273 \times 1.293}{1} =28.98 g/mol=28.98\, g / mol Molecular mass =2×=2 \times vapour density VD=28.982=14.49VD =\frac{28.98}{2}=14.49