The molecular weight of a gas is g/mol if 3.5 g of the gas occupies 2.1 L at STP.

Question

Quizplus · Accepted Answer

To calculate the molecular weight of the gas, we need to use the following formula:

Molecular weight = (mass of gas in grams)/(volume of gas in liters * molar volume at STP)

At STP, the molar volume of a gas is 22.4 L/mol.

So, molecular weight = (3.5 g)/(2.1 L * 1 mol/22.4 L) = 37 g/mol

Therefore, the best choice is D, with a molecular weight of 37.

The Molecular Weight of a Gas Is G/mol If 3