1.

In gaseous reactions important for the understanding of the upper atomoshphere H_2O and O react bimolecularly to form two OH radicals .DeltaH for this reaction is 72 kJ mol^(-1)at 500 K and E_a is 77 kJ mol^(-1) then E_a for the bimolecular recombination of two OH radicals to form H_2O to O is:

Answer»

`3 kJ mol^(-1)`
`4 kJ mol^(-1)`
`5 kJ mol^(-1)`
`7 kJ mol^(-1)`

Answer :C


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