The rate of diffusion of methane at a given temperature is twice that of a gas X. The molecular weight of X is

It is given that 4 2 CH X r r , where r = rate of diffusion The rate of diffusion is inversely proportional to the square root of its molar mass. 4 4 2 16 4 16 64.0 g/mol CH X X CH X X X X X r M r M r M r M M >> >> >>