If the total pressure of water vapor and hydrogen gas is 1.02 atm and the partial pressure of the water at 22.0 C is 0.13 atm, what is the pressure of the hydrogen gas?

0.89 atm is the pressure of the hydrogen gas

Explanation:

We can use the molar fractions to solve this

Sum of molar fractions (hydrogen + water vapor) = 1

Molar fraction = Pressure gas / Total pressure

Molar fraction water vapor = 0.13 atm/1.02 atm = 0.127

1 - 0.127 = 0.873 (Molar fraction H2)

0.873 = Pressure H2 / Total pressure

0.873 = Pressure H2 / 1.02 atm

0.873. 1.02atm = 0.89 atm