compare hte rates of effusion of hydrogen and argon? What is the average velocity of a Cl molecule at 35C?

Answer 1

Rate of effusion is based on Graham's Law. The logical part is that lighter molecules will move faster than heavier molecules. Since this relates to kinetic energy, the square of velocity is involved, which translates here into the square root of the repsective masses.

Specifically, Hydrogen gas is H2 and has a mass of 2.
Argon gas has a mass of 40.

The relative rate of effusion for hydrogen compared to Argon would be the square root of 40/2.