Problem: The gas-phase reaction Cl(g) + HBr(g)HCl(g) + Br(g) has an overall energy change of -66 kJ. The activation energy for the reaction is 7 kJ.What is the activation energy for the reverse reaction?

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We’re being asked to determine the activation energy for the reverse reaction when overall energy change of -66 kJ with activation energy is 7 kJ


We’re given the following information:


ΔH = –66 kJ: Recall that the change in enthalpy or overall energy change (ΔH) is the difference in energy between products and reactants. ΔH for the reaction is negative, which means we have an exothermic reaction. This signifies that the reactants are higher in energy than the products.


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The gas-phase reaction Cl(g) + HBr(g)HCl(g) + Br(g) has an overall energy change of -66 kJ. The activation energy for the reaction is 7 kJ.

What is the activation energy for the reverse reaction?

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