The values of enthalpies of reactants and products are x and y J/mol, respectively. If the activation energy for the backward reaction is z J/mol, then the activation energy for forward reaction will

Question

The values of enthalpies of reactants and products are x and y J/mol, respectively. If the activation energy for the backward reaction is z J/mol, then the activation energy for forward reaction will be (in J/mol)

Prashant Kotian · Accepted Answer

Correct answer: D. The enthalpy of reaction is defined as Δ H = H_products - H_reactants = y - x. We also have the relation: Δ H = E_a(forward) - E_a(backward). Substituting the values: y - x = E_a(forward) - z => E_a(forward) = y - x + z.

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