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.

+ 130 kJ/mole

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– 78 kJ/mole

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-130 kJ/mole

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137kJ/mole

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Solution

The correct option is C
-130 kJ/mole

$C_{6} H_{10} + H_{2} (g) \to C_{6} H_{12} (g) Δ H = ?$

$H_{2} (g) + \frac{1}{2} O_{2} (g) ⟶ H_{2} O (ℓ) Δ H = - 300$

$C_{6} H_{10} (g) + \frac{17}{2} O_{2} (g) ⟶ 6 C O_{2} + 5 H_{2} O Δ H = - 3600$

$6 C O_{2} (g) + 6 H_{2} O ⟶ C_{6} H_{12} (g) + 9 O_{2} Δ H = 3770 ¯ ¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯ ¯ C_{6} H_{10} (g) + H_{2} (g) ⟶ C_{6} H_{12} (g) Δ H = - 130 k J / m o l e - -------------------------------------------------------- -$

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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})

are

- 241, - 3800

and

- 3920 K J / m o l e

respectively. Calculate the heat of hydrogenation of cyclohexene.

The standard enthalpy of combustion at 25∘ C of hydrogen, cyclohexene (C6H10) and cyclohexane (C6H12) are -241, -3800 and -3920 KJ/mole respectively. Calculate the heat of hydrogenation of cyclohexene.

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 heat of neutralization of $C H_{3} C O O H, H C O O H, H C N$ and $H_{2} S$ are -12.8, -13.2, -3.2 and -3.9 Kcal per equivalent. Arrange these acids in increasing order of strength.

Q. 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 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}

)

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