c$.$ Consider a chloroform$/$THF mixture with x$1=0\mathrm{.}8$ initially at $50$ oC and $70$ kPa.

Describe the evolution of the phases and phase compositions as the pressure is

gradually reduced to $50$ kPa. $(5$ marks$)$

d$.$ Consider a chloroform$/$THF mixture with x$1=0\mathrm{.}9$ initially at $50$ oC and $50$ kPa.

Describe the evolution of the phases and phase compositions as the pressure is

gradually increased to $70$ kPa