III. The pressure above a mixture of ethanol and ethyl acetate at $70C$ is measured to be $86$kPa. What are the possible compositions of the liquid and vapor phases?

Figure $12\mathrm{.}19$: Pxy diagram for vapor$/$liquid equilibrium of ethanol$(1)/$ethyl acetate $(2)$ at $70C.$

IV$.$ Consider an ethanol $(1)/$ethyl acetate $(2)$ mixture with $x_1=0\mathrm{.}70,$ initially at $70C$ and $100$kPa. Describe the evolution of phases and phase compositions as the pressure gradually reduces to $70$kPa.

V$.$ What is the composition of the azeotrope for the ethanol $(1)/$ethyl acetate $(2)$ system? Would this be called a high$-$boiling or lowboiling azeotrope?