Question

500 ml. of a gas 'X' at s.t.p. weights 0.50 g. Calculate the vapour density and molecular weight of the gas.

• A. 11.2 gm & 22.4 gm
• B. 5.6 gm & 11.2 gm
• C. 112 gm & 224 gm
• D. 56 gm & 112 gm

Answer 1

The correct option is A 11.2 gm & 22.4 gm

As we know, one mole of a gaseous substance occupies 22.4 litre volume.
Mole $=w/M$

so $\frac{500}{22400}=\frac{0.50}{M}$
$⟹M=22.4gm$
Vapour density $=\frac{M}{2}=11.2gm$