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Volume of Gases and Number of Moles

The standard ...

Question

The standard enthalpy of combustion at $25^{o} C$ of hydrogen, cyclohexene $(C_{6} H_{10})$ and cyclohexane $(C_{6} H_{12})$ are -241, -3800 and -3920 kJ/mole respectively. Calculate the heat of hydrogenation of cyclohexene.

A

-111 kJ/mole

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B

-121 kJ/mole

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C

-118 kJ/mole

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D

-128 kJ/mole

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Solution

The correct option is B -121 kJ/mole
The required reaction is
$C_{6} H_{10} + H_{2} C y c l o h e x e n e ⟶ C_{6} H_{12} C y c l o h e x e n e$ , $△ H_{1} = ?$ ...(1)
Let us write the given facts
$H_{2} + \frac{1}{2} O_{2} ⟶ H_{2} O$
$△ H_{2} = - 241 k J / m o l$ ...(2)
$C_{6} H_{10} + \frac{17}{2} O_{2} ⟶ 6 C O_{2} + 5 H_{2} O$ ,
$△ H_{3} = - 300 k J / m o l e$ ...(3)
$C_{6} H_{12} + 9 O_{2} ⟶ 6 C O_{2} + 6 H_{2} O$ ,
$△ H_{4} = - 3920 k l / m o l e$ ...(4)
The-required-reaction (1) can be obtained by adding equations (2) and (3), and subtracting (4) from the sum of (2) and (3).
$C_{6} H_{10} + H_{2} ⟶ C_{6} H_{12}$
$△ H_{1} = (△ H_{2} + △ H_{3}) - △ H_{4}$
$= [- 241 + (- 3800)] - (- 3920)$
$= (- 241 - 3800) - (- 3920)$
$= - 4041 + 3920 = - 121 k J / m o l e$

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Similar questions

Q. The standard enthalpy of combustion at

25^{\circ} C

of hydrogen, cyclohexene

(C_{6} H_{10})

and cyclohexane

(C_{6} H_{12})

- 241, - 3800

- 3920 K J / m o l e

respectively. Calculate the heat of hydrogenation of cyclohexene.

Q. The enthalpy of combustion of

H_{2}

(C_{6} H_{10})

and cyclohexane

(C_{6} H_{12})

are -241, -3800 and -3920 kJ/mol respectively. Heat of hydrogenation of cyclohexene is:

Q. The enthalpies of combustion at

25^{o}

H_{2}

(C_{6} H_{12})

and cyclohexene

(C_{6} H_{10})

- 241, - 3920

- 3800

kJ/mol respectively. The heat of hydrogenation of cyclohexene is:

Q. The standard enthalpy of combustion at

25^{o} C

of hydrogen, cyclohexene (

C_{6} H_{10}

) and cyclohexane (

C_{6} H_{12}

- 241, - 3800 a n d - 3920 k J m o l^{- 1}

respectively. Calculate the heat of hydrogenation of cyclohexene ( in

k J m o l^{- 1}

)

Enthalpy of hydrogenation is the enthalpy change when one mole of unsaturated compound is converted to saturated compound. $Δ_{H} h y d r o g e n a t i o n$ helps to calculate resonance energy.

The standard enthalpy of combustion at $25^{\circ} C$ of hydrogen, cyclohexene and cyclohexane are -300, -3600 and -3770 KJ/mole respectively. Calculate the heat of hydrogenation of cyclohexene.

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