First slide

Gaseous state

Question

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

Moderate

A

14.56
B

0.0013
C

0.0026
D

7.69

Solution

$p = \frac{dRT}{m} ∴ m = \frac{dRT}{p} d = 0 .0013 g / mL = 1 .3 g / L ∴ m = \frac{1 .3 \times 0 .0821 \times 273}{1} = 29 .12 g {mol}^{- 1} ∴ Vapour density = \frac{molar mass}{2} = \frac{29 .12}{2} = 14 .56$

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