Question

When Raoult’s law and Dalton’s law hold for the mixture, the K factor is

(a) Pi/P

(b) Yi/Xi

(c) Y*/X

(d) X*/X

I had been asked this question during an online interview.

This is a very interesting question from Bubble Point Method topic in chapter Rigorous Distillation Calculations of Distillation Design

Answer 1

Correct choice is (a) Pi/P

Easy explanation: When Raoult’s law and Dalton’s law hold for the mixture, the K factor is Pi/P, indicating Pi as the partial pressure of system and P as total pressure.