# A sample of hydrogen gas is mixed with water vapor. The mixture has a total pressure of 745torr, and the water vapor has a partial pressure of 24 torr. What is the partial pressure of the hydrogen gas?

May 22, 2015

Use the Daltons law of partial pressures : the total pressure of the mixture is the sum of the partial pressures of all the gases present provided these gases are non-reacting

${P}_{T o t a l} = {p}_{{H}_{2} O} + {p}_{{H}_{2}}$
745=24+ x
x=721 torr