Question

One litre of a gas at NTP weighs 1.97g. Find the vapour density of the gas.

• A. $44.128$
• B. $22.06$
• C. $11.03$
• D. None of these

Answer 1

Answer: (B)

$22.06$

Solution:- (B) $22.06$

At NTP,

Weight of $1L$ of a gas $=1.97g\left(\text{Given}\right)$

Therefore,

Weight of $22.4L$ of gas $=1.97\times 22.4=44.128g$

Therefore,

Molecular weight of gas $=44.12g$

$\therefore$ Vapour density $=\frac{\text{Molar mass}}{2}=\frac{44.128}{2}=22.06$

Hence the vapour density of gas is $22.06$.