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What is meant by the term averge bond enthalpy ? Why is there difference in bond enthalpy of O-H bond in ethanol (C_(2)H_(5)OH) and water ? |
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Answer» Solution :All the similar bonds in a molecule do not have the same bond enthaipies ,e.g., in`CH_(4) (H-underset(H)underset(|)overset(H)overset(|)C-H)`, the four C-H bonds do not have the same bond enthapies because after breaking of the bonds one by one, the electronic environmentaroundcarbon changes . Hence, the actual bond enthalpy of C-H bond is TAKEN as the averae value. O-H bond in ethanol  and that in WATER  do nothave similar electronicenviroment around oxygen atom. Hence, their O-H bond enthalpies are DIFFERENT |
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