Question

How do you use Dalton's law to calculate partial pressure?

Answer 1

Dalton's law of partial pressure states that in a gaseous mixture, the partial pressure exerted by a gaseous component, its partial pressure is the same as if it ALONE occupied the container.

Explanation:

See this answer for the partial pressure of oxygen in our atmosphere. And thus the pressure exerted by a gas in a mixture is proportional to its mole fraction.