Question

The vapour density of a gas is 11.2, at N.T.P. how much volume will occupy?

• A. 1.12 litres
• B. 0.112 litres
• C. 11.2 litres
• D. 12 litres

Answer 1

The correct option is C 11.2 litres

Vapour density (V.D.)=$\frac{\text{Molecular weight}}{2}$

$11.2\times 2=$Molecular weight

Molecular weight=$M_w$=22.4 grams

Moles=$n=\frac{m}{M_w}=\frac{11.2}{22.4}=0.5$

At N.T.P., number of moles$=n=\frac{Volume\left(L\right)}{22.4L}$

$0.5\times 22.4=$ Volume

$\therefore$Volume $=11.2$ litres