The reaction A (l) → R(g) is allowed to reach equilibrium conditions in an autoclave. At equilibrium, there are two phases, one a pure liquid phase of A and the other a vapor phase of A, R and S. Initially A alone is present. The numbers of degrees of freedom are ?

Question

Accepted Answer

2. The system has two phases (liquid and vapor) and the composition of each phase is fixed by equilibrium. This means there are two independent variables needed to define the state.