Question

A gives B ,H=-10kJ/mol activationenergy is 50kJ/mol what is the activation energy for the reverse reaction?

Answer 1

So the activation energy for the reverse reaction is the sum of the enthalpy (delta H) and the activation energy (Eact) for the forward reaction. Note that the enthalphy change is negative for the forward reaction. ... If the forward reaction is endothermic, reactants will be lower in the energy diagram than products.