According to the Graham’s Law of diffusion, the rate of diffusion of a
gas is inversely proportional to the square root of it’s density or
molecular weights. If r1 and r2 are the rates of diffusion of two
gases, whose densities under the given conditions are d1 and d2
respectively, then we have … read more-
http://smartlearnwebtv.com/iitjee/IITJEE/grahams-law-of-diffusion/