$1$

$5$

$.$

$2$

$$Plot the vapour pressure data for a mixture of benzene

$($

B

$)$

$$and ethanoic acid

$($

E

$)$

$$given below and plot the vapour pressure

$/$

composition curve for the mixture at

$5$

$0$

$\backslash$

deg C

$.$

$$Then confirm that Raoult's and Henry's laws are obeyed in the appropriate regions. Deduce the activities and activity coefficients of the components on the Raoult's law basis and then, taking B as the solute, its activity and activity coefficient on a Henry's law basis. Finally, evaluate the excess Gibbs energy of the mixture over the composition range spanned by the data.

$0$

$.$

$0$

$1$

$6$

$0$

$0$

$.$

$0$

$4$

$3$

$9$

$$XE

$0$

$.$

$0$

$8$

$3$

$5$

$0$

$.$

$1$

$1$

$3$

$8$

$0$

$.$

$1$

$7$

$1$

$4$

$0$

$.$

$4$

$8$

$4$

$0$

$.$

$9$

$6$

$7$

$1$

$.$

$5$

$3$

$5$

$1$

$.$

$8$

$9$

$2$

$.$

$4$

$5$

$$Pi

$/$

kPa Pg

$/$

kPa

$3$

$5$

$.$

$0$

$5$

$3$

$4$

$.$

$2$

$9$

$3$

$3$

$.$

$2$

$8$

$3$

$2$

$.$

$6$

$4$

$3$

$0$

$.$

$9$

$0$

$0$

$.$

$3$

$6$

$9$

$6$

$0$

$.$

$5$

$8$

$3$

$4$

$0$

$.$

$2$

$9$

$7$

$3$

$0$

$.$

$6$

$6$

$0$

$4$

$0$

$.$

$8$

$4$

$3$

$7$

$0$

$.$

$9$

$9$

$3$

$1$

$$X

$$

$3$

$.$

$8$

$3$

$4$

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$8$

$4$

$5$

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$3$

$6$

$3$

$.$

$3$

$1$

$6$

$.$

$7$

$6$

$7$

$.$

$2$

$9$

$$Pp

$/$

kPa Pg

$/$

kPa

$2$

$6$

$.$

$0$

$8$

$2$

$0$

$.$

$4$

$2$

$2$

$8$

$.$

$1$

$6$

$1$

$8$

$.$

$0$

$1$

$1$

$0$

$.$

$0$

$0$

$.$

$4$

$7$