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The sum of the activation energy for the forward reaction and the enthalpy change equals the activation energy for the reverse reaction in an exothermic process. Which equation represents this relationship?

1. Activation energy (forward) + enthalpy change = activation energy (reverse)
2. Activation energy (reverse) + enthalpy change = activation energy (forward)
3. Activation energy (forward) - enthalpy change = activation energy (reverse)
4. Activation energy (reverse) - enthalpy change = activation energy (forward)

Correct answer: Activation energy (forward) + enthalpy change = activation energy (reverse)

Solution

For any reaction, the relationship between the activation energy of the forward reaction (Ea(forward)), the activation energy of the backward reaction (Ea(backward)), and the enthalpy change (ΔH) is given by Ea(forward) + ΔH = Ea(backward). This equation holds true for both exothermic and endothermic reactions.

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