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For an endothermic reaction, energy of activation is Ea and enthalpy of reaction is ΔH (both of these in kJ/mol). Minimum value of Ea will be:

1. less than ΔH
2. equal to ΔH
3. more than ΔH
4. equal to zero

Correct answer: more than ΔH

Solution

For an endothermic reaction, the products have higher energy than the reactants, so the activation energy (Ea) must account for both the energy required to overcome the activation barrier and the enthalpy change (ΔH). Thus, Ea will always be greater than ΔH.

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