$($a$)$ Estimate the difference in enthalpy $($in $\frac{J}{m}ol)$ betweer saturated liquid carbon

tetrachloride at $80C,$ and carbon tetrachloride vapor at $100C$ and $0\mathrm{.}6$ bar.

Sketch the path taken on P$-$v diagram.

The following data is given

Equation of state of the gas phase is given by $z=1+\frac{BP}{RT}$ where $\frac{B}{R}=-8\mathrm{.}5K$

bar ${?}^{-1}$ and is a constant.

Saturated vapour pressure of carbon tetrachloride at $80C$ and $100C$ is $1\mathrm{.}1$ bar

and $1\mathrm{.}95$ bar respectively

Latent heat of vaporization at normal boiling point $(334\mathrm{.}3$ K$)$ is $29\mathrm{.}8k\frac{J}{m}ol.$

$T_c=536\mathrm{.}6K,=0\mathrm{.}218$

Heat capacity of carbon tetrachloride vapour is $130\frac{J}{m}ol-K$ and may be

assumed to be constant.

$($b$)$ Determine the internal energy departure function for carbon tetrachloride

vapor at $100C$ and $0\mathrm{.}6$ bar.