A sample of air contains nitrogen, oxygen and saturated with water vapour under a total pressure of 640 mm. If the vapour pressure of water at that temperature is 40 mm and the molecular ratio of N2:O2 is 3 : 1. Find the partial pressure of nitrogen in the sample.

A sample of air contains nitrogen, oxygen and saturated with water vap

1.	A sample of air contains nitrogen, oxygen and saturated with water vapour under a total pressure of 640 mm. If the vapour pressure of water at that temperature is 40 mm and the molecular ratio of N2:O2 is 3 : 1. Find the partial pressure of nitrogen in the sample.
Answer» A sample of air contains nitrogen, oxygen and saturated with water vapour under a total pressure of 640 mm. If the vapour pressure of water at that temperature is 40 mm and the molecular ratio of $N_{2} : O_{2}$ is 3 : 1. Find the partial pressure of nitrogen in the sample.