The density of a gas is 1.35 g/L at standard temperature and pressure (STP). What is the molar mass of the gas at STP?

Name: The density of a gas is 1.35 g/L at standard temperature and pressure (STP). What is the molar mass of the gas at STP?
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Quizplus · Accepted Answer

At STP, 1 mole of any gas occupies 22.4 L. The density of the gas is given as 1.35 g/L. Therefore, the mass of 1 mole of the gas (its molar mass) is 1.35 g/L * 22.4 L = 30.24 g/mol, which is approximately 30.2 g/mol.

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