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Water and oxygen atoms react in upper at...

Water and oxygen atoms react in upper atmospheric level bimolecularly to form two `OH` radicals having heat of reaction `72 kJ` at `400 K` and energy of activation being `77 kJ mol^(-1)`. Calculate the `E_(a)` for bimolecular combination of two `OH` radicals to form `H_(2)O` and `O`-atom.

Text Solution

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The correct Answer is:
5
`H_(2)O+O overset(E_(a)=77 kJ)(hArr) 2OH, DeltaH=72 kJ`
`2 OH rarr H_(2)O+O, DeltaH=-72 kJ`
`DeltaH=E_(a(f))-E_(a(b))`
`-72=E_(a(f))-77`
or `E_(a(f))=5 KJ`
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