Chemical Kinetics and Nuclear ChemistryMedium
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
Options
A.149 kJ/mol
B.72 kJ/mol
C.5 kJ/mol
D.7 kJ/mol
Solution
$\Delta H = E_{af} - E_{ab} \Rightarrow 72 = 77 - E_{ab} \Rightarrow E_{ab} = 5\text{ kJ/mol}$
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