Question

The vapour density of a gas is 11.2. What is the volume occupied by 10g of the gas at STP?

• A. 1 L
• B. 12 L
• C. 10 L
• D. 6 L

Answer 1

The correct option is C

10 L

Molecular mass is twice the vapour density.

So the gas molecular mass would be 22.4.

So the gas has $\frac{10}{22.4}$ moles.

We know, 1 mole occupies 22.4 L at STP.

So $\frac{10}{22.4}$ moles would occupy $\frac{10}{22.4}\times 22.4$ = 10 L at STP.