BRAINCAKEUsing Mean Bond Enthalpies to Calculate Enthalpy Change
The enthalpy change is calculated from
total bond enthalpies reactants - total bond enthalpies products.
| bond | mean bond enthalpy kJmol-1 | ||
| N≡N | 945 | ||
| H-H | 436 | ||
| N-H | 391 |
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Key terms in this lesson
- Enthalpy
- A measure of the heat energy stored in a chemical system.
- Enthalpy change
- The heat energy transferred between the system and its surroundings during a process carried out at constant pressure.
More in Energetics
- The Enthalpy Change of Formation
- The Enthalpy Change of Combustion
- Thermochemical Cycles and Enthalpy Diagrams
- Bond Enthalpies
- Comparison with Thermochemical Cycles
- Example Question - 1
- Example Question - 2
- Example Question - 3
All 24 lessons in Energetics · All AQA AS-level Chemistry topics