In a hypothetical reaction

CHEMISTRY · Single correct · A Level · Chemistry · Kinetics · Kinetics

Problem

In a hypothetical reaction, the potential energy of the reactants is 40 kJ mol⁻¹, the peak of the transition state is 110 kJ mol⁻¹, and the potential energy of the products is 15 kJ mol⁻¹. Which pair of values for ΔH\Delta H and the activation energy EaE_{\text{a}} corresponds to these data? (a) ΔH=+25 kJ mol−1;  Ea=95 kJ mol−1\Delta H = +25\,\text{kJ}\,\text{mol}^{-1};\;E_{\text{a}} = 95\,\text{kJ}\,\text{mol}^{-1} (b) ΔH=+25 kJ mol−1;  Ea=70 kJ mol−1\Delta H = +25\,\text{kJ}\,\text{mol}^{-1};\;E_{\text{a}} = 70\,\text{kJ}\,\text{mol}^{-1} (c) ΔH=−25 kJ mol−1;  Ea=70 kJ mol−1\Delta H = -25\,\text{kJ}\,\text{mol}^{-1};\;E_{\text{a}} = 70\,\text{kJ}\,\text{mol}^{-1} (d) ΔH=−25 kJ mol−1;  Ea=110 kJ mol−1\Delta H = -25\,\text{kJ}\,\text{mol}^{-1};\;E_{\text{a}} = 110\,\text{kJ}\,\text{mol}^{-1}

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