For a certain elementary step

CHEMISTRY · Single correct · A Level · Chemistry · Energetics · Energetics

Problem

For a certain elementary step, the forward activation energy is 80 kJ mol−180\,\text{kJ mol}^{-1} and the reverse activation energy is 30 kJ mol−130\,\text{kJ mol}^{-1}. Which of the following gives the enthalpy change and thermodynamic character of the forward reaction? (a) ΔH=+80 kJ mol−1\Delta H = +80\,\text{kJ mol}^{-1}; the forward reaction is endothermic (b) ΔH=+50 kJ mol−1\Delta H = +50\,\text{kJ mol}^{-1}; the forward reaction is endothermic (c) ΔH=−50 kJ mol−1\Delta H = -50\,\text{kJ mol}^{-1}; the forward reaction is exothermic (d) ΔH=+110 kJ mol−1\Delta H = +110\,\text{kJ mol}^{-1}; the forward reaction is endothermic

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