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.

The standard ethelpy of combustion at `25^(@)C` of hydrogen, cyclohexe

1.	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.
Answer» Correct Answer - `-121kJ" " mol^(-1)` `H_(2)(g)+(1)/(2)O_(2)(g)toH_(2)O(g)," "(DeltaH=-241kj" "mol^(-1))` . . (i) `C_(6)H_(10)(g)+(17)/(2)O_(2)(g)to6CO_(2)(g)+5H_(2)O(g),(DeltaH=-3800kJ" "mol^(-1))` . . .(ii) `C_(6)H_(12)9g)+9O_(2)(g)to6CO_(2)(g)+6H_(2)O,(DeltaH=-3920kJ" "mol^(-1))` . . (iii) Adding eqs. (i) and (ii) and subtracting eq. (iii), `C_(6)H_(10)(s)+H_(2)(g)toC_(6)H_(12)(s),` `DeltaH=-241-3800-(-3920)=-121kJ" "mol^(-1)`

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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.

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