$12\mathrm{.}30.$ What is the composition of the liquid phase in equilibrium with a vapor$-$phase ethanol$(1)/$ethyl acetate$(2)$ mixture of the following compositions at $P=1$ bar?

$($a$)y_1=0\mathrm{.}1$

$($b$)y_1=0\mathrm{.}2$

$($c$)y_1=0\mathrm{.}3$

$($d$)y_1=0\mathrm{.}45$

$($e$)y_1=0\mathrm{.}6$

$($f$)y_1=0\mathrm{.}8$

$($g$)y_1=0\mathrm{.}9$