BRAINCAKEHess's Law
If a reaction can take place by two routes the total enthalpy change for each route is the same provided that the starting and finishing conditions are the same.
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Key terms in this lesson
- Enthalpy
- A measure of the total energy of a chemical system.
- Enthalpy change
- The heat energy that is transferred between the system and its surroundings during a process carried out at constant pressure.
More in Enthalpy
- Determining the Enthalpy Change of a Reaction
- Cooling Curves
- Average Bond Enthalpy
- Calculating Enthalpy Changes from Bond Enthalpies
- Limitations of Bond Enthalpy Calculations
- Determination of Enthalpy Change of a Reaction from Enthalpies of Formation Using Hess's Law
- Determination of Enthalpy Change of a Reaction from Enthalpies of Combustion using Hess's Law
- Exam-style Question
All 19 lessons in Enthalpy · All OCR AS-level Chemistry topics