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In a reversible reaction, the energy of activation of the forward reaction is 50 kcal. The energy of activation for the reverse reaction will be:

1. < 50 kcal
2. either greater than or less than 50 kcal
3. 50 kcal
4. > 50 kcal

Correct answer: either greater than or less than 50 kcal

Solution

The energy of activation for the reverse reaction depends on the enthalpy change (ΔH) of the reaction. If the forward reaction is exothermic, the reverse reaction will have a higher activation energy, and if the forward reaction is endothermic, the reverse reaction will have a lower activation energy.

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