What is meant by the term average bond enthalpy? Why is there difference in bond enthalpy of O—H bond in ethanol (C2H5OH) and water?
What is meant by the term average bond enthalpy? Why is there difference in bond enthalpy of O—H bond in ethanol (C2H5OH) and water?
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1 Answer
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This is a Short Answer Type Questions as classified in NCERT Exemplar
Ans: The average bond enthalpy is defined as the ratio of total bond dissociation enthalpy to the number of bonds broken in the structure.
The identical O- H bonds in water molecule does not have the same bond enthalpies. According to the structure of a water molecule, there are two O- H bonds, but there is a change in the breaking of the first O- H bond than the second because of the different charge.
Hence in water molecule the average bond enthalpy will be:
The average O-H bond enthalpy = = 464 mol-1
In ethanol C2H5OH the bond enthalpy of O-H is different becaus
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