The formation enthalpies, for and are 220.0 and 250.0 kJ mol, respectively, at 298.15 K, and for is kJ mol at the same temperature. The average bond enthalpy of the O–H bond in water at 298.15 K

Question

The formation enthalpies,  for  and  are 220.0 and 250.0 kJ mol, respectively, at 298.15 K, and  for  is  kJ mol at the same temperature. The average bond enthalpy of the O–H bond in water at 298.15 K is  kJ mol (nearest integer).

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Strategy:
 Bond enthalpy is the energy required to break  mole of bonds to produce gaseous atoms. For water, the average bond enthalpy is half of the total atomization energy: .

Step 1: Calculate Atomization Enthalpy
Reaction:

.

Step 2: Calculate Average O-H bond energy
Average .

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