why is there difference in bond enthalpy of O-H bond in ethanol and water?

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Solution

There is a difference in bond enthalpy of O-H bond in ethanol and water because of difference in electronegativity of hydrogen and carbon. As electronegativity difference in hydrogen and oxygen is higher than that in carbon and oxygen so O-H bond in water has more bond enthalpy than in ethanol.

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O - H

(C_{2} H_{5} O H)

Question 51

What is meant by the term average bond enthalpy? Why is there difference in bond enthlpy of O - H bond in ethanol $(C_{2} H_{5} O H)$ and water?

H_{2}, X_{2}

H X

- 50 k J m o l^{- 1}

H_{2}

H_{2} (s)

N_{2} (g)

436.0 k J {m o l}^{- 1}

{N H}_{3} (g)

- 46 k J {m o l}^{- 1}

{N H}_{3} (g)

N - H

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