Applications
Hess's law of constant heat summation is useful in the determination of enthalpies of the following:
- Heats of very slow reactions
- Heats of formation of unstable intermediates like CO(g) and NO(g).
- Heat changes in phase transitions and allotropic transitions.
- Lattice energies of ionic substances by constructing Born-Haber cycle, and for calculating electron gain enthalpies.
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