ICSE Class 10 Chemistry 2016 Solved Paper

Question : 26

Total: 85

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

Solution:

The mass of 22.4l of gas at S.T.P. is equal to its gram molecular mass.
20 lit. of gas at S.T.P. weighs =32g
∴22.4 litres of gas will weigh =‌

×22.4
=35⋅84‌gms.
≃36‌gms .
Therefore, Gram molecular weigh of the gas is 36 gms.

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