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 isA. `-121 kJ mol^(-1)`B. `+121 kJ mol^(-1)`C. `-242 kJ mol^(-1)`D. `+242 kJ mol^(-1)`

The enthalpy of combustion of `H_(2)` , cyclohexene `(C_(6)H_(10))` an

1.	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 isA. `-121 kJ mol^(-1)`B. `+121 kJ mol^(-1)`C. `-242 kJ mol^(-1)`D. `+242 kJ mol^(-1)`
Answer» Correct Answer - A `H_(2)(g)+(1)/(2)O_(2)(g) rarr H_(2)O(l) (Delta H = -241 kJ)` ...(i) `C_(6)H_(10) +(17)/(2)O_(2)(g) rarr 6CO_(2)(g)+5H_(2)O(l)` `(Delta H = -3800 kJ)` ...(ii) `C_(6)H_(12)+9O_(2)(g) rarr 6CO_(2)(g)+6H_(2)O(l)` `Delta H = -3920 kJ)` ...(iii) Eq. (i) + eq. (ii) -eq. (iii) gives `Delta H = -241-3800-(-3920) = -121 kJ` for `C_(6)H_(10) + H_(2) rarr C_(6)H_(12)`

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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 isA. `-121 kJ mol^(-1)`B. `+121 kJ mol^(-1)`C. `-242 kJ mol^(-1)`D. `+242 kJ mol^(-1)`

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