9.4 Hess' law and enthalpy cycles
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4 Terms
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Hess’ law
Allows enthalpy changes to be determined indirectly and comes from the idea of the conservation of energy.
**States that if a reaction can take place by two routes, and the starting and finishing conditions are the same, the total enthalpy change is the same for each route.**
**States that if a reaction can take place by two routes, and the starting and finishing conditions are the same, the total enthalpy change is the same for each route.**
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Enthalpy change for formation using Hess’ law
Enthalpy change of formation
**Products - reactants**
**Products - reactants**
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Enthalpy change for combustion using Hess’ law
Enthalpy change of combustion
**Reactants - Products**
**Reactants - Products**
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Summary
enthalpy change of formation = products - reactants
enthalpy change of combustions = reactants - products
enthalpy change of combustions = reactants - products