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Bond energies of (H - H), (O = O) and (...

Bond energies of `(H - H), (O = O) and (O - H)` are 105, 120 and 220 kcal/mol respectively, then magnitude of `Delta H` in the reaction in kcal is :
`2H_(2)(g) + O_(2)(g) rarr 2H_(2)O(l)`

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