1. Diffusion and Effusion
11.4

2. Definitions Definition of diffusion and effusion are…
The ________the particle the faster it will move.
Graham’s law of effusion – the rate of effusion of gases at the same T and P are inversely proportional to the square roots of their molar masses

3. Effusion Rate of effusion of A = MB Rate of effusion of B = MA
Compare the rates of effusion of H2 and O2 at the same T and P.
A sample of H2 effuses thru a porous container about 9x faster than an unknown gas. Estimate the molar mass of the unknown gas.