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The enthalpy changes at 25^(@)C in succe...

The enthalpy changes at `25^(@)C` in successive breaking of O - H bonds of water are :
`H_(2)O(g) rarr H(g) + OH(g) Delta H = 498 kJ mol^(-1)`
`OH(g) rarr H(g) + O(g) Delta H = 428 kJ mol^(-1)`
The bond enthalpy of the O-H bond is :

A

`498 kJ mol^(-1)`

B

`463 kJ mol^(-1)`

C

`428 kJ mol^(-1)`

D

`70 kJ mol^(-1)`

Text Solution

Verified by Experts

The correct Answer is:
B
Bond enthalpy of O_H bond = `(498 + 428)/(2)`
`= 463 kJ mol^(-1)`
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