Question

1 L of a gas at STP weighs 1.97 g. What is the vapour density of the gas?

• A. 44.1
• B. 22.05
• C. 88.2
• D. 10.10

Answer 1

Answer: (B)

$\because$ 1 L of a gas at STP weighs = 1.97 g $\therefore$ 22.4 L of the gas at STP will weigh = 1.97 $\times$ 22.4
= 44.1 g
$\therefore$ Molecular weight = 44.1 g
Molecular weight = 2 $\therefore$ vapour density
Vapour density = $\frac{44.1}{2}=22.05$