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Question

In gaseous reactions important for understanding the upper atmosphere, H2O and O react biomolecularly to form two OH radicals. ΔH for this reaction is 72 kJ at 500 K and Ea=77kJmol1, then calculate Ea for the biomolecular recombination of 2OH radicals to form H2O & O at 500 K.

A
5kJmol1
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B
149kJmol1
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C
10kJmol1
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D
None of these
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Solution

The correct option is B 5kJmol1
H2O+O[Eb]Ea2HOΔH=72kJ
T=500K
Ea=77kJ/mole ΔH=EaEb
72=77Eb
Eb=7772
Eb=5kJ

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