Final answer:
Graham's law of diffusion states that the rate of diffusion or effusion of a gas is inversely proportional to the square root of its molar mass.
Step-by-step explanation:
Graham's law of diffusion states that the rate of diffusion or effusion of a gas is inversely proportional to the square root of its molar mass. In simpler terms, lighter gases diffuse more quickly than heavier gases. This can be understood by comparing two gases at the same temperature, where the gases have the same kinetic energy. The kinetic energy of a moving object is given by the equation KE = mv², where m is mass and v is velocity. By setting the kinetic energies of the two gases equal to each other, we can derive the relationship.