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H(2)(g) +(1)/(2)O(2)(g) rarr H(2)O(g) De...

`H_(2)(g) +(1)/(2)O_(2)(g) rarr H_(2)O(g) DeltaH =- 242 kJ mol^(-1)`
Bond energy of `H_(2)` and `O_(2)` is `436` and `500 kJ mol^(-1)`, respectively. What is bond energy of `O-H` bond?

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`H_(2)(g) +(1)/(2)O_(2)(g) rarr H_(2)O(g) DeltaH =- 242 kJ mol^(-1)`
`DeltaH =` Bond energy of reactants -Bond energy of products
`DeltaH = B_(H-H) +(1)/(2) B_(O=O) - 2B_(O-H)`,
`- 242 kJ = 436 +(1)/(2) (500) - 2B_(O-H)`
`-928 kJ =- 2B_(O-H) rArr B_(O-H) = (928)/(2) = 464 kJ mol^(-1)`
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