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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.

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`Delta H = sum Delta H_("comb")^(@) ("reactants") - sum Delta H_("comb")(@)("products") = -3800 - 241 - (-3920) = -121 kJ//mol`
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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.

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