Q$5$ equilibrium:

$($a$)$ Pure liquid benzene.

$($b$)$ A mixture of ice and water only.

$($c$)$ A mixture of liquid benzene, benzene vapor, and helium gas.

$($d$)$ A mixture of salt and water designed to achieve a specific vapor pressure.

$($e$)$ A vessel contains air: $N_2(g),O_2(g),$ and $Ar(g).$ Repeat for a vessel one $-$ third filled with liquid ethanol and two $-$ thirds filled with $N_2$ plus ethanol vapor.