Persistent confusion of total entropy and chemical system entropy in chemical thermodynamics.
basic_science · Level V
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- Record sourced from PubMed, PMID 8755493.
- Also identified by PMC identifier 38764.
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Abstract
The change in free energy with temperature at constant pressure of a chemical reaction is determined by the sum (dS) of changes in entropy of the system of reagents, dS(i), and the additional entropy change of the surroundings, dS(H), that results from the enthalpy change, W. A faulty identification of the total entropy change on reaction with dS(i) has been responsible for the attribution of general validity to the expressions (d deltaG/dT)p = -deltaS(i) and d(deltaG/T)/d(1/T)= deltaH, which are found in most textbooks and in innumerable papers.
Medical subject headings
- Models, Chemical
- Thermodynamics