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The relationship ΔH = Ea(forward) - Ea(reverse) indicates that the activation energy for the reverse reaction is influenced by whether the process is exothermic or endothermic.

1. ΔH = Ea(forward) - Ea(reverse)
2. ΔH = Ea(reverse) - Ea(forward)
3. ΔH = Ea(forward) + Ea(reverse)
4. ΔH = Ea(reverse) + Ea(forward)

Correct answer: ΔH = Ea(forward) - Ea(reverse)

Solution

The relationship ΔH = Ea(f) - Ea(b) is correct, where Ea(f) is the activation energy for the forward reaction and Ea(b) is for the reverse reaction. The energy of activation for the reverse reaction depends on whether the reaction is exothermic or endothermic, as it affects the relative energy levels of reactants and products.

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