The reaction represented above goes essentially to completion. The reaction takes place in a rigid, insulated vessel that is initially at 600 K. What can be inferred about S° for the reaction at 600 K?
(A) It must be positive, since the reaction is thermodynamically unfavorable at 600 K.
(B) It must be negative, since there are more moles of products than reactants.
(C) It must be positive, since G° is negative and H° is positive.
(D) It must be negative, since G° is positive and H° is positive.