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:
(A) 1
(B) 2
(C) 3
(D) 0
(A) 1
(B) 2
(C) 3
(D) 0