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A gas of mass 32 gms has a volume of 20 litres at S.T.P. Calculate the gram mol. weight of the gas.

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A gas of mass 32 gms has a volume of 20 litres at S.T.P. Calculate the gram mol. weight of the gas. 

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The mass of 22.4 l of gas S.T.P is equal to its garm molecular mass.

20 litres of gas at S.T.P weighs = 32 g

1 litre of gas at S.T.P. weights = 32/20 g

∴ 22 .4 litres of gas will weigh = 32/20 x 22.4 = 35.84 g

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