The enthalpy changes at 25°C in successive breaking of O–H bonds of water are: H₂O(g) → H(g) + OH(g), ΔH = 498 kJ mol⁻¹ OH(g) → H(g) + O(g), ΔH = 428 kJ mol⁻¹ The bond enthalpy of the O–H bond is:
- A498 kJ mol⁻¹
- B463 kJ mol⁻¹
- C428 kJ mol⁻¹
- D70 kJ mol⁻¹
✓ Correct answer: B
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