The reaction profile diagram shows the conversion of reactants to products.
We know that the energy diagram is the diagram that is drawn to show the interaction between species as they move from the reactants to products. We can see that in the reaction profile the energy us plotted on he vertical axis and the reaction pathway is plotted on the horizontal axis.
Now the topmost part of the curve is the activated complex. The activation energy of the reaction is the line that terminates at the curve for the reactants. The corner at the left is for the reactants while the corner at the right is for the products. The enthalpy change is the difference between the energies of the reactants and the products.
All these are shown in the reaction profile attached here.
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