GRAHAM'S LAW OF EFFUSION (p. 387 in text book)
* compares the rates of effusion of different gases
* lighter gases (lower molar masses) effuse faster than heavier gases (higher molar masses)
= MM B
rate B MM A
the rate of gas A compared to the rate of gas B is equal to the square root of the inverse of the molar masses of the gases
EXAMPLE 1: Compare the rates of effusion for oxygen gas and hydrogen gas.
EXAMPLE 2: An unknown gas effuses 1.18 times faster than SO2. What is the molar mass of the unknown gas?