Our enthalpy page is specifically designed to help students with Chapter 16: Energy and Chemical Change of the Chemistry Matter and Change textbook. If you have any questions or ideas on how to make this page better, please e-mail Marci@RegalLessons.com.
What is Enthalpy?
Enthalpy tells us the heat content of a system at constant pressure. You can watch this Crash Course video for a deeper understanding.
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Enthalpy Changes
- ∆Hrxn = Hfinal – Hinitial
- enthalpy change = productions – reactants
- Endothermic: +∆H
- Example: NH4NO3 + 27 kJ –> NH4+ +NO3–
- Exothermic: -∆H
- Example: 4Fe + 3O2 –> 2Fe2O3 + 1625 kJ
- Combustion: burning; -∆H
- Fusion: melting; positive; +∆H
- Liquid to solid: opposite of fusion; -∆H
- Vaporization: liquid to gas; +∆H
- Condensation: gas to liquid; -∆H
- Formation: make one mole of compound from elements; 0.0 kJ
Standard Enthalpies of Formation Table
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