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Q.

The density of a gas at 0oC and 1 atm is 1.25 g/L. Molar mass of that gas is _____ g/mol.

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answer is 28.

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Detailed Solution

Density of gas 1.25 g/L means mass of 1 L gas at STP is 1.25g
Therefore, mass of 22.4 L at STP =  1.25×22.4=28(molecular mass)
 

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