Question

A gas exerts a pressure of 0.892 atm in a 5.00 L container at 15º C. The density of the gas is 1.22 g/L. What is the molecular weight of the gas?

• A. 32 g/mol
• B. 32.3 g/mol
• C. 33.2 g/mol
• D. 33 g/mol

Answer 1

The correct option is B

32.3 g/mol

T = 273 + 15 = 288 K

PV = nRT

0.892 x 5 = n x 0.0821 x 288

n = 0.189 mol

(molecular weight) = 32.3g / mol.