Answer
Liquid: $30 \% \mathrm{~N}_2$ and $70 \% \mathrm{O}_2$
Vapor: $67 \% \mathrm{~N}_2$ and $33 \% \mathrm{O}_2$
Work Step by Step
From the equilibrium diagram we read:
Liquid: $30 \% \mathrm{~N}_2$ and $70 \% \mathrm{O}_2$
Vapor: $67 \% \mathrm{~N}_2$ and $33 \% \mathrm{O}_2$