6.55. A vapor stream that is 65 mole% styrene and 35 mole% toluene is in equilibrium with a liquid mixture of the same two species. The pressure in the system is 150 mm Hg absolute. Use Raoult’s law to estimate the composition of the liquid and the system temperature

The composition of vapor is 0.86 and the composition of toluene is 0.14

Explanation:

Given:

Vapor composition

Toluene composition

Pressure of the system mm Hg

From Raoult's law,

For toluene,

For vapor,

Since,

Since are dependent on temperature.

At K, value of mm Hg and mm Hg

So calculate

For    

Therefore, the composition of vapor is 0.86 and the composition of toluene is 0.14

the answer is option a.

a is the correct answer