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aivan3 [116]
4 years ago
4

Combustion reactions are relatively easy to carry out and study, and their data can be combined to give enthalpies of other type

s of reactions. As an illustration, calculate the standard enthalpy of hydrogenation of cyclohexane given that the standard enthalpies of combustion of the two compounds are -3752 kJ mol-1 (cyclohexene) and -3953 kJ mol-1 (cyclohexane).
Chemistry
1 answer:
sammy [17]4 years ago
7 0

Answer:

ΔH = -201 kJ/mol

Explanation:

The Hess' Law say that the enthalpy of one reaction is equal to the sum of all the steps:

C6H12 + 9O2 --> 6CO2 + 6H2O    ΔH = -3752 kJ

C6H10 + 17/2O2 --> 6CO2 + 5H2O ΔH = -3953 kJ

C6H10 + H2O --> C6H12 + 1/2O2 ΔH = -3953 + 3752

ΔH = -201 kJ/mol

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