Answer : The potential energy diagram is shown below.
Explanation :
Activation energy : The energy required to initiate the reaction is known as activation energy.
Or, it is the amount of energy required to reach the transition state.
Or, It is the minimum amount of energy that is absorbed by the reactant molecules so that their energy becomes equal to the threshold energy.
Or, the difference between the reactant and the transition state.
Enthalpy of a reaction : It is the energy change which takes place when the reactants go to the products. It is represented as,
Or, we can say that the difference between the product and the reactant.
If the heat is absorbed during the reaction then the enthalpy of reaction is positive and the reaction endothermic reaction.
If the heat is released during the reaction then the enthalpy of reaction is negative and the reaction exothermic reaction.