Chemistry hw question

Question

If a molecule of H2 diffuses a speed of 340 m/s from a point source, calculate the speed that a molecule of O2 would diffuse under the same conditions for the same period of time.

Answer 1

Graham's Law of Effusion/Diffusion:

rate gas 1/rate gas 2 = sqrt MW gas 2/sqrt MW gas 1

MW H2 = 2

MW O2 = 32

rate H2/rate O2 = sqrt 32/sqrt 2

340/x = 4

x = 85 m/s