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  3. Chemistry
  4. The standard enthalpy of combustion at 25° C of hydrogen, cyclohexene ( C 6 H 10) and cyclohexane ( C 6 H 12) are -241, -3800 and -3920 kJ / mol respectively. Calculate the heat of hydrogenation of cyclohexene.

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Q. The standard enthalpy of combustion at $25^{\circ} C$ of hydrogen, cyclohexene $\left( C _{6} H _{10}\right)$ and cyclohexane $\left( C _{6} H _{12}\right)$ are $-241, -3800$ and $-3920\, kJ / mol$ respectively. Calculate the heat of hydrogenation of cyclohexene.

IIT JEEIIT JEE 1989Thermodynamics

Solution:

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$\Delta H=\Sigma \Delta H_{\text{comb }}^{\circ}$ (reactants) $-\Sigma \Delta H_{\text{comb }}1^{\circ}$ (products)
$=-3800-241-(-3920)$
$=-121 \,kJ / mol$