2. Molecular Speed Of A Gas
Depends on the mass of the gas molecules and the temperature they are at
R is in different units and has a different value ( R=8.3145)
M is in kg/mole

3. Example Find the speed of hydrogen gas at 25o C.
Find the speed of oxygen gas at 25o C.

4. Effusion
Gas escapes through tiny holes when a pressure difference is present

5. Diffusion
Gases will mix uniformly

6. Graham’s Law
Rate of both effusion and diffusion is inversely related to the square root of their weights
Shows the relationship between rate and molecular weight

7. Example
If an unknown gas effuses at a rate that is only .468 times that of oxygen at the same temperature, what is its molecular weight?