In gaseous reactions important for the understanding of the upper atmosphere, and O react bimolecularly to form two OH radicals. Δ H for this reaction is 72 kJ at 500 K and E_a is 77 kJ/mol, then E_a

Question

In gaseous reactions important for the understanding of the upper atmosphere, $H_2O$ and O react bimolecularly to form two OH radicals. Δ H for this reaction is 72 kJ at 500 K and E_a is 77 kJ/mol, then E_a for the bimolecular recombination of two OH radicals to form $H_2O$ and O is

Prashant Kotian · Accepted Answer

Correct answer: C. For a chemical reaction, the enthalpy of reaction is related to the activation energies of the forward and backward reactions by the relation: Δ H = E_a(forward) - E_a(backward). Given: Δ H = 72 kJ/mol and E_a(forward) = 77 kJ/mol. Substituting these values: 72 = 77 - E_a(backward) => E_a(backward) = 77 - 72 = 5 kJ/mol.

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