$10\mathrm{.}7.$ A single$-$stage liquid$/$vapor separation for the benzene$(1)/$ethylbenzene$(2)$ system must

produce phases of the following equilibrium compositions. For one of these sets, deter$-$

mine the $T$ and $P$ in the separator. What additional information is needed to compute

the relative amounts of liquid and vapor leaving the separator? Assume that Raoult's

law applies.

$($a$)x_1=0\mathrm{.}35,y_1=0\mathrm{.}70$

$($b$)x_1=0\mathrm{.}35,y_1=0\mathrm{.}725.$

$($c$)x_1=0\mathrm{.}35,y_1=0\mathrm{.}75.$

$($d$)x_1=0\mathrm{.}35,y_1=0\mathrm{.}775.$