Question

What is the degrees of freedom of a system with a mixture of copper pyrites, liquid benzene and helium?

(a) 1

(b) 2

(c) 3

(d) 4

I got this question during an interview.

This interesting question is from Gibbs Phase Rule in division Two Phase Gas – Liquid Systems, Phase Rule and Vapor-Liquid Equilibria of Basic Chemical Engineering

Answer 1

The correct option is (b) 2

For explanation I would say: F = 2 – 3 + 3 = 2.