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  4. 1 L of a gas at STP weighs 1.97 g. What is the vapour density of the gas?

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

KEAMKEAM 2004Some Basic Concepts of Chemistry

Solution:

$\because$ 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 = $\frac{44.1}{2} = 22.05$