In gaseous reaction important for the understanding of the upper atmosphere H2O and O react bimolecularly to form two OH radicals. ΔH for this reaction is 72 kJ at 500 K and Ea is 77 kJ mol−1 Ea for the bimolecular recombination of two OH radicals to form H2O and O is: (in kJ mol−1)

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In gaseous reaction important for the understanding of the upper atmosphere H₂O and O react bimolecularly to form two OH radicals. ΔH for this reaction is 72 kJ at 500 K and E_a is 77 kJ mol⁻¹ Ea for the bimolecular recombination of two OH radicals to form H₂O and O is: (in kJ mol⁻¹)

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The reaction is:

H₂O + O → 2OH,

ΔH = −72kJ;

E_a= 77kJ/mol

2OH → H₂O + O , E_a = ? (Refer to Image)

E_{a for the reverse reaction}

= (E_a)_forward+ ΔH =77 + (−72) = 5kJ