The activation energy is the difference between the highest point on the potential energy graph and the energy of the reactants on the graph.
The term activation energy has to do with the energy that reactant molecules must posses in order for collision between them to result in chemical reaction.
The question is incomplete as the potential energy diagram for the reaction is jot shown. However, the activation energy is the difference between the highest point on the potential energy graph and the energy of the reactants on the graph.
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