page 12 21. Some energy values associated with a chemical reaction are shown in the table. Enthalpy of reactants (kJ mol−1) Activation energy of forward reaction (kJ mol−1) Activation energy of reverse reaction (kJ mol−1) 30 110 70 Which of the following correctly shows the potential energy diagram for the above conditions? 0 0 0 0 20 20 20 20 40 40 40 40 60 60 60 60 80 80 80 80 100 100 100 100 120 120 120 120 140 140 140 140 potential energy (kJ mol−1) potential energy (kJ mol−1) potential energy (kJ mol−1) potential energy (kJ mol−1) reaction pathway reaction pathway reaction pathway reaction pathway reactants reactants reactants reactants products products products products A B C D