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What does Hess's law state?
That the enthalpy change for a reaction is independent of the route taken
Propane formation can be represented by the following equation
3C + 4H2→ C3H8
Calculate the enthalpy change for the reaction using the enthalpies of combustion of carbon, hydrogen and propane given in the SQA data booklet.
ΔH= -106 kJ mol-1
Ethyne can be converted to ethane by reaction with hydrogen.
C2H2 + 2H2 → C2H6
Calculate the enthalpy change for the reaction using the enthalpies of combustion of ethyne, hydrogen and ethane given in the SQA data book
ΔH= -312 kJ mol-1