In gaseous reactions important for the understanding of the upper atmosphere, H2O and O react bimole

Question

In gaseous reactions 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, then Ea for the bimolecular recombination of two OH radicals to form H2O and O is

Accepted Answer

$\Delta H = E_{af} - E_{ab} \Rightarrow 72 = 77 - E_{ab} \Rightarrow E_{ab} = 5	ext{ kJ/mol}$

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