For a particular reaction: A2(g)+3B2(g)C3(g). the values of Kp are 1.8102 and 3.9102 at 500K and 400K, respectively. Which of the following statements is true? a) The reaction is exothermic b) The partial pressures of A2,B2, and C3 are the same at equilibrium c) The reaction is endothermic d) KC=Kp(RT)3 e) At 500K there is an excess of reactants at equilibrium