A mixture contains 1 mol each of liquid benzene and liquid toluene. At 300 K the vapor pressure of the pure tolyene is 32.06 torr, and that of pure benzene is 103.01 torr.

(a) If the pressure over the mixture is reduced at 300 K, at what pressure does boiling start?

(b) What is the composition of the first trace of vapor boiled off?

(c) If the pressure is lowered further, at what pressure does the last trace of liquid disappear?

(d) What is the composition of the last trace of liquid?

Question

A mixture contains 1 mol each of liquid benzene and liquid toluene. At 300 K the vapor pressure of the pure tolyene is 32.06 torr, and that of pure benzene is 103.01 torr.

(a) If the pressure over the mixture is reduced at 300 K, at what pressure does boiling start?

(b) What is the composition of the first trace of vapor boiled off?

(c) If the pressure is lowered further, at what pressure does the last trace of liquid disappear?

(d) What is the composition of the last trace of liquid?

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