The reaction of ethylene (C₂H₄) with butadiene (C₄H₆) to form cyclohexene (C₆H₁₀) has an activation energy (E_a) of 115 kJ/mol. The reverse reaction (decomposition of cyclohexene to ethylene and butadiene) has an activation energy of 287 kJ/mol. What is the heat of reaction, Δ H_rxn, for the forward reaction?

Question

Quizplus · Accepted Answer

The heat of reaction, ΔH_rxn, can be calculated using the difference between the activation energies of the forward and reverse reactions. Given that the activation energy of the forward reaction is 115 kJ/mol and the reverse reaction is 287 kJ/mol, ΔH_rxn = 115 kJ/mol - 287 kJ/mol = -172 kJ/mol.

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