A tank containing both HF and HBr gases developed a leak. The ratio of the rate of effusion of HF to the rate of effusion of HBr is .
A) 4.04
B) 16.3
C) 0.247
D) 0.497
E) 2.01

Question

Quizplus · Accepted Answer

The rate of effusion of gases is inversely proportional to the square root of their molar masses (Graham's law). The molar mass of HF is approximately 20 g/mol, and the molar mass of HBr is approximately 81 g/mol. The ratio of the rates of effusion is the square root of (81/20), which is approximately 2.01.

A Tank Containing Both HF and HBr Gases Developed a Leak