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The standard enthalpy of combustion at 25 °C of $H_{2} (g)$ cyclohexene(g) and cyclohexane(g) are - 241, - 3800 and $- 3920 kJ {mol}^{- 1}$ respectively. The standard enthalpy of hydrogenation of cyclohexene will be

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121 kJ {mol}^{- 1}

- 1211 kJ {mol}^{- 1}

- 121 kJ {mol}^{- 1}

- 242 kJ {mol}^{- 1}

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detailed solution

Correct option is C

$C_{6} H_{10} (g) + H_{2} (g) \to C_{6} H_{12} (g)$

$(I) C_{6} H_{12} (g) + 9 O_{2} (g) \to 6 {CO}_{2} (g) + 6 H_{2} O (l)$

$(ii) C_{6} H_{10} (g) + \frac{17}{2} O_{2} (g) \to 6 {CO}_{2} (g) + 5 H_{2} O (1)$

$(iii) H_{2} (g) + \frac{1}{2} O_{2} (g) \to H_{2} O (l)$

$Δ H = Δ H_{(ii)} + Δ H_{(iii)} - Δ H_{(i)} = [- 3800 - 241 - (- 3920)] kJ {mol}^{- 1} = - 121 kJ {mol}^{- 1}$

Thus the option C is correct.

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The standard enthalpy of combustion at 25 °C of H2(g) cyclohexene(g) and cyclohexane(g) are - 241, - 3800 and −3920 kJ mol−1 respectively. The standard enthalpy of hydrogenation of cyclohexene will be

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Ready to Test Your Skills?

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The standard enthalpy of combustion at 25 °C of $H_{2} (g)$ cyclohexene(g) and cyclohexane(g) are - 241, - 3800 and $- 3920 kJ {mol}^{- 1}$ respectively. The standard enthalpy of hydrogenation of cyclohexene will be