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

The standard enthalpy of combustion at 25 °C of H2(g) cyclohexene(g) and cyclohexane(g) are - 241, - 3800 and 3920 kJ mol1 respectively. The standard enthalpy of hydrogenation of cyclohexene will be

  1. A

    121 kJ mol1

  2. B

    1211 kJ mol1

  3. C

    121 kJ mol1

  4. D

    242 kJ mol1

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    Solution:

    C6H10(g)+H2(g)C6H12(g)

    (I) C6H12(g)+9O2(g)6CO2(g)+6H2O(l)

     (ii) C6H10(g)+172O2(g)6CO2(g)+5H2O (1) 

     (iii) H2(g)+12O2(g)H2O(l)

    ΔH=ΔH(ii) +ΔH(iii) ΔH(i)  =[3800241(3920)]kJmol1 =121kJmol1

    Thus the option C is correct.

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