The bond energies (in kJ/mol) at 25°C are C-C = 346, C-H = 413, H-H = 437, C=C = 611. From these dat — Thermodynamics and Thermochemistry Chemistry Question
Question
The bond energies (in kJ/mol) at 25°C are C-C = 346, C-H = 413, H-H = 437, C=C = 611. From these data, the value of δ H at 25°C for the hydrogenation of cyclohexene is
Answer: B
💡 Solution & Explanation
Cyclohexene(g) + $H_2$(g) -> Cyclohexane(g). Bonds broken: 1 C=C + 1 H-H = 611 + 437 = 1048. Bonds formed: 1 C-C + 2 C-H = 346 + 2*413 = 1172. δ H = 1048 - 1172 = -124 kJ/mol.
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