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The standard ethelpy of combustion at 25...

The standard ethelpy of combustion at `25^(@)C` of hydrogen, cyclohexene `(C_(6)H_(10))`, and cyclohexane `(C_(6)H_(12))` are `-241,-3800`, and `-3920 kJ mol^(-1)` repectively. Calculate the heat of hydrogenation of cyclohexane.

Text Solution

Verified by Experts

We have to find `DeltaH` for
`C_(6)H_(10)+H_(2) rarr C_(6)H_(12),DeltaH=?`
Given,
`H_(2)+(1)/(2)O_(2) rarr H_(2)O, Delta=-241kJ ....(1)`
`C_(6)H_(10)+(17)/(2)O_(2) rarr 6CO_(2)+5H_(2)O, DeltaH=-3800kJ ...(2)`
`C_(6)H_(12)+9O_(2)rarr 6CO_(2)+6H_(2)O, DeltaH=-3920kJ ...(3)`
Adding `eqs. (1)` and `(2)` and then subtracting `eq.(30` as above ltbr. `C_(6)H_(10)+H_(2) rarr C_(6)H_(12),DeltaH=-121kJ`
`:. ` Heat of hydrogenation of `C_(6)H_(10)=-121kJ`
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The standard enthalpy of combustion at 25^(@)C of hydrogen, cyclohexene (C_(6)H_(10)) , and cyclohexane (C_(6)H_(12)) are -241,-3800 , and -3920 kJ mol^(-1) repectively. Calculate the heat of hydrogenation of cyclohexene.

The standard enthalpy of combustion at 25^(@)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.

Knowledge Check

  • The enthalpy of combustion of H_(2) , cyclohexene ( C_(6)H_(10) ) and cyclohexane ( C_(6)H_(12) ) are -241, – 3800 and - 3920 kJ "mol"^(-1) respectively. The heat of hydrogenation of cyclohexene is:

    A
    `121 "kJ mol"^(-1)`
    B
    `-121 "kJ mol"^(-1)`
    C
    `+242 "kJ mol"^(-1)`
    D
    `-242 "kJ mol"^(-1)`

  • The enthalpy of combustion at 25^(@)C of H_(2) , cyclohexane (C_(6)H_(12)) and cyclohexene (C_(6)H_(10)) are -241, -3920 and -3800 KJ/mole respectively. The heat of hydrogenation of cyclohexene is

    A
    `- 121` KJ/mole
    B
    `+ 121` KJ/mole
    C
    `- 242` KJ/mole
    D
    `+ 242` KJ/mole

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

    The enthalpy of combustion at 25^(@)C of H_(2)(g) , cyclohexane and cyclohexene are -241, 3920 and -3717 kJ "mole"^(-1) respectively. The heat of hydrogenation of cyclohexene is ( Kcal/mole) approximate integer:

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