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The mass of 11.2 litre of a certain gas ...

The mass of 11.2 litre of a certain gas at S.T.P. is 24 g. Find the gram molecular mass of the gas.

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Mass of gas = 24 g
Volume of gas = 11.6 litre
22.4 L of gas at STP = 1 mole
11.2 L of gas at STP = `11.2 // 22.4` = 0.5 moles
Mass of 0.5 moles of gas = 24 g
Mass of 1 mole of gas or molar mass = `24//0.5` = 48 g
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