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CNG,LNG,LPG

The standard ...

Question

The standard enthalpies of combustion at $25^{o} C$ of hydrogen, cyclohexene $(C_{6} H_{10})$ and cyclohexane $(C_{6} H_{12})$ are $- 241, - 3800$ and $- 3920$ $k J {m o l}^{- 1}$ respectively. Calculate the heat of hydrogenation of cyclohexene.

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Solution

Heat of hydrogenation of cyclohexene = enthalpy of combustion of hydrogen + enthalpy of combustion of cyclohexene - enthalpy of combustion of cyclohexane
Heat of hydrogenation of cyclohexene = $241 + (- 3800) - (- 3920)$ = $- 121 K J m o l^{- 1}$

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