1.

For the reaction: 2H_(2(g)) + O_(2(g)) rarr 2H_2O_((g)) , DeltaH = -571 kJ bond energy of (H-H) = 435 kJ, of (O = O) = 498kJ , then the average bond energy of O-H bond using the above data

Answer»

`484kJ`
`-84kJ `
`271kJ`
`-271kJ`

ANSWER :A


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