Average bond enthalpy of water is $464.5 \text{ kJ mol}^{-1}$. If the energy required to break the first $O-H$ bond is $502 \text{ kJ mol}^{-1}$,how much energy per mol is required to break the second $O-H$ bond?
- A$929 \text{ kJ mol}^{-1}$
- B$251 \text{ kJ mol}^{-1}$
- C$427 \text{ kJ mol}^{-1}$
- D$678 \text{ kJ mol}^{-1}$
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