Question

The vapour density of a gas is 22.4. The density of the gas at $STP$ is:

• A. 2 $g/L$
• B. 1 $g/L$
• C. 3 $g/L$
• D. 1.5 $g/L$

Answer 1

The correct option is A 2 $g/L$

Vapour density of the gas is = 22.4

At STP, Volume of the gas = 22.4 litres/mole

Molar Mass = 2 $\times$ Vapour density = 2 $\times$ 22.4 = 44.8 g/mole

$Density=\frac{Mass}{Volume}=\frac{44.8}{22.4}=2g/L$