Chapter 1, Problem 1.27NP

A mixture of ${\text{H}}_{\text{2}}$ and ${\text{NH}}_{\text{3}}$ has a volume of $\text{139}.0{\text{ cm}}^{\text{3}}$ at $0.00°\text{C}$ and 1 atm. The mixture is cooled to the temperature of liquid nitrogen at which ammonia freezes out and the remaining gas is removed from the vessel. Upon warming the vessel to $0.00°\text{C}$ and 1 atm, the volume is $\text{77}.{\text{4cm}}^{\text{3}}$. Calculate the mole fraction of NH3 in the original mixture,