SATHEE: Thermodynamics and Thermochemistry 2 Question 25

Thermodynamics and Thermochemistry 2 Question 25

25. The standard enthalpy of combustion at $25^{\circ} C$ of hydrogen, cyclohexene $\left(\mathrm{C}{6} \mathrm{H}{10}\right) $a n d c y c l o h e x a n e$ \left(\mathrm{C}{6} \mathrm{H}{12}\right) $a r e - 241, - 3800 a n d$ -3920 \mathrm{~kJ} / \mathrm{mol}$ respectively. Calculate the heat of hydrogenation of cyclohexene.

(1989, 2M)

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Solution:

$Δ H = Σ Δ H_{comb}^{\circ}$ (reactants) $- Σ Δ H_{comb}^{\circ}$ (products)

$\begin{aligned} = - 3800 - 241 - (- 3920) & = - 121 kJ / mol \end{aligned}$

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Thermodynamics and Thermochemistry 2 Question 25

25. The standard enthalpy of combustion at 25∘C of hydrogen, cyclohexene $\left(\mathrm{C}{6} \mathrm{H}{10}\right)andcyclohexane\left(\mathrm{C}{6} \mathrm{H}{12}\right)are−241,−3800and-3920 \mathrm{~kJ} / \mathrm{mol}$ respectively. Calculate the heat of hydrogenation of cyclohexene.

Solution:

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