Question

A gas diffuses 1/8 times faster than hydrogen gas. what is the molar mass of the gas?

129.02 g/mol
136.44 g/mol
140.81 g/mol
145.45 g/mol

Answer 1

129.02 g/mol.

Step-by-step explanation:

We apply grahams law of diffusion:

1/8 = √2.016/√m where m = molar mass

√m = 8√2.016

m = (8√2.016) = 129.02 g/mol.