A flask with a volume of 3.16 L contains 9.33 grams of an unknown gas at 32.0°C and 1.00 atm. What is the molar mass of the gas?
A)7.76 g/mol
B)66.1 g/mol
C)74.0 g/mol
D)81.4 g/mol
E)144 g/mol

Question

Quizplus · Accepted Answer

To find the molar mass, use the ideal gas law: PV = nRT. First, convert the temperature to Kelvin (32.0°C = 305.15 K). Then, calculate the number of moles (n) using n = PV/RT, where P = 1.00 atm, V = 3.16 L, R = 0.0821 L·atm/mol·K, and T = 305.15 K. After finding n, use the formula molar mass = mass/n. The calculation gives a molar mass of approximately 74.0 g/mol.

A Flask with a Volume of 3