The given question is incomplete. The complete question is:
Which molecule would diffuse faster , or ,? Explain your reasoning.
Answer: will diffuse faster as it has low molecuklar weight.
Explanation:
From Graham's law of diffusion rates, the rate of diffusion of a gas is inversely proportional to the square root of its molar mass.
or
Molecular mass of is 64 g/mol and Molecular mass of is 80 g/mol
Thus as molecular mass of is less , it will diffuse faster.