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The enthalpy of combustion of H(2) , cyc...

The enthalpy of combustion of `H_(2)` , cyclohexene `(C_(6)H_(10))` and cyclohexane `(C_(6)H_(12))` are `-241` , `-3800` and `-3920KJ` per mol respectively. Heat of hydrogenation of cyclohexene is

A

`-121` KJ per mol

B

`+121` KJ per mol

C

`+242` KJ per mol

D

`-242` KJ per mol

Text Solution

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The correct Answer is:
A

`DeltaH=[DeltaH` of combustion of cyclohexane -`(DeltaH` of combustion of cyclohexene + `DeltaH` of combustion of `H_(2))]`
`-[-3920 -(-3800-241)] KJ`
`=-[-3920-(-3800-241)] KJ`
`-[-3920 + 4041 KJ =-[121] KJ =-121 KJ`
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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 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:

Enthalpy of combustion of CH_(4) , C_(2)H_(6) and C_(3)H_(8) are -210-370 and -530Kcal//mol respectivaly. The approximate value of enthalpy of combustion of n -hexane is

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

  • Enthalpy of combustion of CH_(4) , C_(2)H_(6) and C_(3)H_(8) are -210-370 and -530Kcal//mol respectivaly. The approximate value of enthalpy of combustion of n -hexane is

    A
    `-1170 (Kcal)/(mol)`
    B
    `-750(Kcal)/(mol)`
    C
    `-1010(Kcal)/(mol)`
    D
    `-590(Kcal)/(mol)`
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