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H(2)O and O atom react in upper atmosphe...

`H_(2)O` and `O` atom react in upper atmosphere bimolecularly to form two `OH` radicals. `DeltaH` for the reaction is `72 kJ` at `500K` and energy of activation is `77kJ mol^(-1)`. Estimate `E_(a)` for bimolecular recombination of two `OH` radicals to form `H_(2)O` and `O` atom.

A

`149 kJ "mol"^(-1)`

B

`-149 kJ "mol"^(-1)`

C

`5 kJ "mol"^(-1)`

D

`-5 kJ "mol"^(-1)`

Text Solution

Verified by Experts

The correct Answer is:
C

`X(H_(2)O_(2) rarr H_(2)O +O) = 77 - 72 = 5 kJ`.
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