Calculate the molar mass of a gas that has a density of 1.428 g/L at STP.
A)15.70 g/mol
B)14.28 g/mol
C)0.4460 g/mol
D)32.01 g/mol
E)0.7002 g/mol

Question

Quizplus · Accepted Answer

At STP (standard temperature and pressure), the conditions are 0°C (273 K) and 1 atm of pressure. The molar volume of a gas at STP is 22.4 L/mol.

We can use the formula:

density = mass/volume

Rearranging the formula:

mass = density x volume

mass = 1.428 g/L x 22.4 L/mol = 32.01 g/mol

Therefore, the molar mass of the gas is 32.01 g/mol, which corresponds to choice D.

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