What is the ratio of diffusion rates for argon and radon?

Question

Which gas diffuses more rapidly?

Answer 1

The lighter gas will diffuse faster.

See Graham's Law where rate gas 1/rate gas 2 = sqrt MW gas 2/sqrt MW gas 1

Argon will diffuse faster

Ar: sqrt 40 = 6.32

Rn: sqrt 222 = 14.9

14.9/6.32 = 2.36

So Ar will diffuse about 2.4x faster than Rn