Calculate the relative molecular mass of $C O_{2}$ if 300 ml of gas at STP weighs 0.30 g. Given 1 litre of $H_{2}$ at STP weighs 0.09 g.

11.11

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22.22

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44.44

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0.02244

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Solution

The correct option is B
22.22

300 ml of $C O_{2}$ at STP weighs 0.30 g

Therefore, 1 litre of $C O_{2}$ at STP will weigh = $\frac{0.30 \times 1000}{300}$ = 1 g

Vapour density = $\frac{W t . o f 1000 m l o f C O_{2} a t S T P}{W t . o f 1000 m l o f H_{2} a t S T P} = \frac{1}{0.09}$ = 11.11

Relative molecular mass = 2 $\times$ V.D. = 2 $\times$ 11.11 = 22.22 g

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