Question

molar volume, density, and molar mass of a gas

1. use the molar volume of a gas at stp to determine the volume (in l) occupied by 27.2 g of argon at stp.

missed this? read section 6.5

Explanation:

Step1: Find moles of argon

Molar mass of Ar is 40.0 g/mol. Moles ($n$) = mass / molar mass = $27.2\ g \div 40.0\ g/mol = 0.68\ mol$.

Step2: Use molar volume at STP

At STP, 1 mol gas = 22.4 L. Volume ($V$) = $n \times 22.4\ L/mol = 0.68\ mol \times 22.4\ L/mol = 15.232\ L$.

Answer:

15.2 L (or 15.232 L, depending on precision)