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ACSEE (Form 6) Energetics — practice questions

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For C₂H₄ + H₂ → CH₃CH₃ with bond enthalpies C–H 416, C=C 612, C–C 348 and H–H 436 kJ, the enthalpy of hydrogenA Born-Haber cycle differs from an enthalpy of formation in that the cycle: