Practice question
Question
The bond enthalpy of O=O in O₂(g) is 498 kJ/mol. What is Δ Hf of O(g)?
Explanation
For O₂(g) → 2O(g), Δ H = 498 kJ/mol. Δ Hf (O₂) = 0, so Δ H = 2 × Δ Hf (O) - 0, Δ Hf (O) = 498 / 2 = 249 kJ/mol.
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