A mixture of chloroform and acetone has a vapour pressure of 311 Torr. Calculate the mole fraction of acetone in the mixture. The vapour pressures of chloroform and acetone are 295 Torr and 332 Torr, respectively. Assume ideal behaviour.
A) 0.432
B) 0.730
C) 0.270
D) 0.619
E) 0.568

Question

Quizplus · Accepted Answer

Using Raoult's Law, the total vapor pressure is the sum of the partial pressures. Let x be the mole fraction of acetone. Then, 311 = x(332) + (1-x)(295). Solving for x gives x = 0.432.

A Mixture of Chloroform and Acetone Has a Vapour Pressure