Question

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

• A. $20L$
• B. $10L$
• C. $25L$
• D. None of these

Answer 1

The correct option is B $10L$

Molar mass$=2\times$Vapour density

Given, Vapour Density$=11.2$

Molar mass$=11.2\times 2=22.4g/mol$

No.of moles of gas$=\frac{10}{22.4}\cong 0.45moles$

At STP, 1 mole occupies $22.4L$ volume.

0.45 moles occupy $22.4\times 0.45=10L$ volume.

$\therefore$ Volume occupied is $10$ litres.