# Worksheet: Vapor Pressure and Relative Humidity

In this worksheet, we will practice defining a vapor's relative humidity as the ratio of the partial pressure of the vapor to its equilibrium vapor pressure.

**Q4: **

Per mole, the atmosphere of a planet consists of nitrogen,
oxygen, and hydrogen. In modeling the
planet’s atmosphere, use a value of 28.0 g/mol for the molar mass of N_{2},
32.0 g/mol for the molar
mass of O_{2}, and 2.02 g/mol for the molar mass of H_{2}.

What is the mass of the nitrogen in 1.0 mol of this planet’s atmosphere?

The atmosphere of this planet is mixed with pentane in a ratio of by mass. Find the partial pressure of pentane in this mixture at an overall pressure of 2.50 atm. Use a value of 72.2 g/mol for the molar mass of pentane.