Imagine a planet that has a similar atmospheric pressure to Earth (760 mmHg), but different concentrations of gases in its atmosphere. On this hypothetical planet, oxygen makes up 10% of the atmosphere, carbon dioxide makes up 15%, and nitrogen makes up the remaining 75%. Based on this information, what is the partial pressure of oxygen on this new planet?

76 mmHg

Explanation:

The partial pressure of a gas in an ideal gas mixture is the pressure that this gas would exercise if it was alone in the same temperature of the gas mixture.

For the Raoult's law, we can determinate the partial pressure of a gas (Pa) knowing the total pressure (P) and its molar fraction (Xa):

Pa = XaP, so for the oxygen:

Pa = 0.10x760

Pa = 76 mmHg