PA = PT XA
Example: A vessel contains 0.75 mol of nitrogen, 0.20 mol of hydrogen, and 0.05 mol of
fluorine at a total pressure of 2.5 atm. What is the partial pressure of each gas?
Solution: First calculate the mole fraction of each gas.
Then calculate the partial pressure:
LAW OF CHARLES AND GAY-LUSSAC
The Law of Charles and Gay-Lussac, more simply known as Charles’s law, states that at constant
pressure, the volume of a gas is directly proportional to its absolute temperature:
where k is a constant and the subscripts 1 and 2 represent two different sets of conditions. A plot of
volume versus temperature is shown below.