The standard enthalpy of combustion at 25,^{c | vedclass

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(B) The required reaction is $C_6H_{10} + H_2 	o C_6H_{12}$,$\Delta H_1 = ? \dots (1)$ Given combustion reactions: $H_2 + \frac{1}{2}O_2 	o H_2O$,$\

Vedclass · Accepted Answer

$-121$

Vedclass · Answer

(B) The required reaction is $C_6H_{10} + H_2 	o C_6H_{12}$,$\Delta H_1 = ? \dots (1)$ Given combustion reactions: $H_2 + \frac{1}{2}O_2 	o H_2O$,$\Delta H_2 = -241 \, kJ/mol \dots (2)$ $C_6H_{10} + \frac{17}{2}O_2 	o 6CO_2 + 5H_2O$,$\Delta H_3 = -3800 \, kJ/mol \dots (3)$ $C_6H_{12} + 9O_2 	o 6CO_2 + 6H_2O$,$\Delta H_4 = -3920 \, kJ/mol \dots (4)$ Applying Hess's Law,the required reaction $(1)$ is obtained by $(2) + (3) - (4)$: $\Delta H_1 = (\Delta H_2 + \Delta H_3) - \Delta H_4$ $\Delta H_1 = (-241 - 3800) - (-3920)$ $\Delta H_1 = -4041 + 3920 = -121 \, kJ/mol$.

The standard enthalpy of combustion at $25\,^{\circ}C$ of hydrogen,cyclohexene $(C_6H_{10})$ and cyclohexane $(C_6H_{12})$ are $-241$,$-3800$ and $-3920\, kJ/mol$ respectively. Calculate the heat of hydrogenation of cyclohexene in $kJ/mol$.

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