Question

For the exothermic reaction $A + B \rightarrow C + D , \Delta H$ is the heat of reaction and $E_{a}$ is the energy of activation. The energy of activation for the formation of $A + B$ will be

• A. $E_{a}$
• B. $\Delta H$
• C. $E_{a}+\Delta H$
• D. $\Delta H-E_{a}$

Answer 1

Answer: (C)

For the exothermic reaciion the energy of products is always less than the reactants. If $E_{a}$ is the energy of activation for the forward reaction, the energy of activation for backward reaction is $E_{a}+\Delta H$