Q.

The density of air at STP is 0.00130 g/ml. Thus, vapour density of air will be

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a

14.56

b

0.0013

c

0.0026

d

7.69

answer is A.

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Detailed Solution

p=dRTm ∴ m=dRTp d=0.0013g/mL=1.3g/L ∴ m=1.3×0.0821×2731=29.12gmol−1 ∴  Vapour density = molar mass 2=29.122=14.56
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The density of air at STP is 0.00130 g/ml. Thus, vapour density of air will be