22.4 litres of a gas at STP weighs 16 g. Identify the gas.

Methane

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Carbon monoxide

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Ethane

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Oxygen

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Solution

The correct option is A Methane
At STP, 1 mole of gas occupies $22.4 l$ .
Given gas occupies $22.4 l$ at STP and has weight 16 g.
So molecular weight of gas is 16.
Thus Ans: Methane (Mol. weight of methane is 16)

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