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In gaseous reactions important for understanding of the upper atmosphere H2O and O react bimolecularly to form two OH radicals. H for this reaction is 72kJ/mol at 500 K and Ea = 77 kJ/ mol, then Ea for two bimolecular recombination of 2OH radicals to form H2O & O is 

(A) 3 kJ mol–1 

(B) 4 kJ mol–1 

(C) 5 kJ mol–1 

(D) 7 kJ mol–1

1 Answer

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Best answer

Correct Option (C) 5 kJ mol–1

Explanation:

As ΔH is positive, therefore reaction is endothermic This is the energy profile diagram for an endothermic reaction. Now when the products is converted back to reactant the energy of activation is x as shown in fig. Evidently x = Ea – ΔH

= (77 – 72) = 5 kJ mol–1.

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