Which will diffuse through a membrane more rapidly, co or n2? assume that the samples contain only the most abundant isotopes of each element, 12c, 16o, and 14n?

I think the answer for the above question is none. The two gases will diffuse at the same rate; simply because they have the same molecular mass. N2 = 28 g and CO = 28 g. From the Graham's law, the rate of diffusion of a fixed mass of a gas is inversely proportional to the square root of its molecular mass. The heavier the gas is the lower the rate of diffusion and vicevarsa.