In a reaction pathway diagram, the activation energy for the forward reaction is typically represented by the difference in energy between the reactants and the peak of the transition state (the highest point on the reaction pathway).
If the arrows in the diagram represent different energy changes, look for the arrow that connects the energy level of the reactants to the peak of the reaction pathway. This would be the activation energy for the forward reaction.
Without the specific diagram, I can't determine which arrow corresponds to the activation energy. However, if you can identify the arrow that points from the reactants to the peak of the curve, that will be the correct answer.
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