Practice question
Question
Calculate the bond enthalpy of H-H in H₂(g) given Δ Hf (H,g) = 218 kJ/mol.
Explanation
For H₂(g) → 2H(g), Δ H = 2 × Δ Hf (H) - Δ Hf (H₂) = 2 × 218 - 0 = 436 kJ/mol, which is the bond enthalpy.
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