Question

Gibbs phase rule for general system is

(a) P+F=C-1

(b) P+F=C+1

(c) P+F=C-2

(d) P+F=C+2

I got this question in exam.

The doubt is from Degrees of Freedom in division Humidity Charts and Analysis of the Degrees of Freedom in Steady-State Processes of Chemical Process Calculation

Answer 1

Correct choice is (d) P+F=C+2

To explain: Gibbs phase rule for general system is, P+F=C+2.