Chapter 14, Problem 55E

Styrene, used in the manufacture of polystyrene plastics, is made by the extraction of hydrogen atoms from ethylbenzene. The product obtained contains about 38% styrene $\left({\text{C}}_{\text{6}}{\text{H}}_{\text{3}}{\text{CH=CH}}_{\text{2}}\right)$ and 62% ethylbenzene $\left({\text{C}}_{\text{6}}{\text{H}}_{\text{3}}{\text{CH}}_{\text{2}}{\text{CH}}_{\text{2}}\right)$ , by mass. The mixture is separated by fractional distillation at $\text{90}°\text{C}$ . Determine the composition of the vapor in equilibrium with this 38%-62% mixture at $\text{90}°\text{C}$ . The vapor pressure of ethylbenzene is 182 mmHg and that of styrene is 134mmHg.