Reaction energy

In chemical thermodynamics, reaction energy is []

In 1905, German physical chemist Fritz Haber, in his Technical Thermodynamics of Gas Phase Reactions, defined reaction energy as follows: [1]

“In Helmholtz’ point of view, a chemical reaction is considered to have a latent heat just as does any change in the state of aggregation; consequently, in my view the two parts into which total energy can be divided are not spoken of as free energy and bound energy but as ‘reaction energy’ and ‘latent energy’.”
— Fritz Haber (1905), Thermodynamics of Technical Gas Reactions (pg. ix)

This term “reaction energy”, in Haber’s view, seems to be a synonym for “free energy”, in Herman Helmholtz’s 1882 parlance, or “available energy”, in Willard Gibbs’ 1876 parlance.

To correct the above definition, in modern, terms "latent energy" is not assumed to be equivalent to bound energy or “transformation content energy” (-TS), in Rudolf Clausius’ 1865 parlance, but rather with the energy that must go into breaking bonds of state, or "bond energy", so to speak, namely: enthalpy of melting (solid → liquid) or enthalpy of evaporation (liquid → gas).

See also
‚óŹ Affinity of reaction

1. Haber, Fritz. (1905). Thermodynamics of Technical Gas Reactions (preface, pg. 3). Longmans, Green, and Co.

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