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Thermodynamics
Question
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Enthalpy change for the reaction,

4H (g) → 2H2 (g) is - 869.6 kJ

The dissociation energy of H - H bond is

  • -869.6 kJ

  • +434.8 kJ

  • +217.4 kJ

  • -434.8 kJ

Answer

B.

+434.8 kJ

4H (g) → 2H2 (g); ΔH = - 869.6 kJ
2H2 (g) → 4 H (g); ΔH =  869.6 kJ
H2 (g) → 2 H (g); ΔH = 869.6/2 = 434.8 kJ

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