Question

The volume of a gas at 21°C temperature and 768 mm pressure is 1 litre. If the density of the gas is 1.2 gm/litre at NTP, then its mass will be

• A. 4 gm
• B. 4.21 gm
• C. 1.13 gm
• D. 10 gm

Answer 1

Answer: (C)

1.13 gm

Answer 2

We have $\frac{PV}{T} = \frac{P_{0}m}{d_{0}T_{o}}$

$\therefore m = \frac{PVd_{0}T_{0}}{TP_{o}} = \frac{760 \times 10^{- 3} \times 1.2 \times 10^{3} \times 273}{76 \times 294} = 1.13gm$