A student is studying the catalytic decomposition of a reactant under controlled conditions. The energy profile diagram for both the uncatalysed (solid line) and catalysed (dashed line) pathways of this reaction is shown below.
What are the activation energy of the reverse catalysed reaction (Ea,rev(cat)E_{a,\text{rev(cat)}}Ea,rev(cat)) and the enthalpy change (ΔH\Delta HΔH) of the forward reaction?
Ea,rev(cat)=+140 kJ mol−1E_{a,\text{rev(cat)}} = +140\text{ kJ mol}^{-1}Ea,rev(cat)=+140 kJ mol−1 and ΔH=−60 kJ mol−1\Delta H = -60\text{ kJ mol}^{-1}ΔH=−60 kJ mol−1
Ea,rev(cat)=+80 kJ mol−1E_{a,\text{rev(cat)}} = +80\text{ kJ mol}^{-1}Ea,rev(cat)=+80 kJ mol−1 and ΔH=−60 kJ mol−1\Delta H = -60\text{ kJ mol}^{-1}ΔH=−60 kJ mol−1
Ea,rev(cat)=+210 kJ mol−1E_{a,\text{rev(cat)}} = +210\text{ kJ mol}^{-1}Ea,rev(cat)=+210 kJ mol−1 and ΔH=−60 kJ mol−1\Delta H = -60\text{ kJ mol}^{-1}ΔH=−60 kJ mol−1
Ea,rev(cat)=+140 kJ mol−1E_{a,\text{rev(cat)}} = +140\text{ kJ mol}^{-1}Ea,rev(cat)=+140 kJ mol−1 and ΔH=+60 kJ mol−1\Delta H = +60\text{ kJ mol}^{-1}ΔH=+60 kJ mol−1