A sample of oxygen gas is collected by displacement of water at 25°C and 1.17 atm total pressure. If the vapor pressure of water is 23.756 mm Hg at 25°C, what is the partial pressure of the oxygen gas in the sample?

1 answer

Ptotal = pO2 + pH2O
You know Ptotal and pH2O, solve for pO2. Note Ptotal and pH2O are not in the same units.