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Enthalpy of hydrogenation of cyclohexene from enthalpies of combustion

The same question, asked 2 times: 13 Apr 2026 S2, 17 Apr 2026 S1. Every wording below, oldest first.

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  1. Question 1

    13 Apr 2026 S2

    5
    The enthalpy of combustion of cyclohexane, cyclohexene and H2\mathrm{H_2} are respectively −3920,−3800-3920, -3800 and −241 KJ mol−1-241\ \mathrm{KJ\,mol^{-1}}. The enthalpy of hydrogenation of cyclohexene is

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  2. Question 2

    17 Apr 2026 S1

    8
    At 25 ∘C25\ ^\circ\mathrm{C} standard enthalpy of combustion of H2\mathrm{H_2}, Cyclohexene and cyclohexane are -241, -3800 and -3920 kJ mol−1\mathrm{mol^{-1}} respectively. What is the heat of hydrogenation of cyclohexene?

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