SAT Subject Test Chemistry,10 edition

(Marvins-Underground-K-12) #1

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.

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