Assume air has an average molar mass of 28 grams/mole, and determine how many moles of air molecules there are 1.0 liters of air, which contains 1.26 grams of air molecules.

Question

Quizplus · Accepted Answer

First, we need to find the number of moles of air molecules in 1.26 grams of air molecules:

moles = mass/molar mass 
moles = 1.26 g / 28 g/mol 
moles = 0.045

Therefore, there are 0.045 moles of air molecules in 1.0 liter of air. The answer is choice C.

Assume Air Has an Average Molar Mass of 28 Grams/mole