For the reaction A rightleftharpoons B,if E_a | vedclass

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Question

(C) For a reversible reaction $A \rightleftharpoons B$,the relationship between the activation energy of the forward reaction $(E_{a,f})$ and the back

Vedclass · Accepted Answer

Can be more or less than $E_a$

Vedclass · Answer

(C) For a reversible reaction $A \rightleftharpoons B$,the relationship between the activation energy of the forward reaction $(E_{a,f})$ and the backward reaction $(E_{a,b})$ is given by $\Delta H = E_{a,f} - E_{a,b}$.If the reaction is exothermic $(\Delta H  E_{a,f}$.If the reaction is endothermic $(\Delta H > 0)$,then $E_{a,b} Therefore,the activation energy of the backward reaction can be more or less than $E_a$ depending on the enthalpy change of the reaction.

For the reaction $A \rightleftharpoons B$,if $E_a$ is the activation energy of the forward reaction,then the activation energy of the backward reaction is:

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