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 can use the following formula:

Molecular weight = (mass of gas / volume of gas) x (molar volume at STP / 1 mole)

We know that the mass of the gas is 3.5 g and the volume is 2.1 L at STP. The molar volume at STP is 22.4 L/mol. Plugging in these values, we get:

Molecular weight = (3.5 g / 2.1 L) x (22.4 L/mol / 1 mole)
Molecular weight = 37 g/mol

Therefore, the best choice is (C) 37.

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