For an endothermic reaction,the energy of act | vedclass

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(C) In an endothermic reaction,the energy of the reactants is less than that of the products.From the potential energy diagram for an endothermic reac

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more than $\Delta H$

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(C) In an endothermic reaction,the energy of the reactants is less than that of the products.From the potential energy diagram for an endothermic reaction,the relationship between the activation energy of the forward reaction $(E_a)$,the activation energy of the backward reaction $(E_a')$,and the enthalpy of reaction $(\Delta H)$ is given by:$E_a = E_a' + \Delta H$Since the activation energy of the backward reaction $(E_a')$ must always be a positive value $(E_a' > 0)$,it follows that:$E_a > \Delta H$Therefore,the minimum value of $E_a$ is greater than $\Delta H$.

For an endothermic reaction,the energy of activation is $E_a$ and the enthalpy of reaction is $\Delta H$ (both in $kJ/mol$). The minimum value of $E_a$ will be:

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For $N_2 + 3H_2 \rightarrow 2NH_3$,$\Delta H = -22 \ kcal$,and $E_a = 70 \ kcal$. Hence $E_a$ for $2NH_3 \rightarrow N_2 + 3H_2$ is $.....$ $kcal$.

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