| Title | An outline of reaction equilibrium |
| Download | Downloads |
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| Licence | Please note the adoption of the Open Government Licence - Canada
supersedes any previous licences. |
| Author | Froese, E |
| Source | Geological Survey of Canada, Current Research (Online) 2006-H2, 2006, 12 pages; 1 CD-ROM, https://doi.org/10.4095/222698  Open Access |
| Image |  |
| Year | 2006 |
| Publisher | Natural Resources Canada |
| Document | serial |
| Lang. | English |
| Media | on-line; CD-ROM; digital |
| Related | This publication is related to An outline of phase
equilibrium |
| File format | pdf |
| Subjects | geochemistry; equilibrium; phase equilibria; chemical analysis; chemical processes; thermodynamics; energy; temperature; pressure-temperature conditions |
| Illustrations | graphs; diagrams |
| Released | 2006 09 01 |
| Abstract | The consideration of the mole numbers of chemical species as variables characterizing a macroscopic state makes it possible to define the affinity of a chemical reaction in terms of thermodynamic
concepts. This approach leads to the basic relationship of reaction equilibrium in a closed system with one chemical reaction:
<>
where G is the total Gibbs energy, (epsilon) is the extent of reaction,Gi is the
partial molar Gibbs energy of a species, and (nu)i is the stoichiometric coefficient. The partial derivative <> is commonly designated as the Gibbs energy change of reaction and given the symbol (Delta)G. At arbitrary values of
(epsilon), (epsilon) can be regarded as a constraint keeping the system in a metastable equilibrium. Upon release of this constraint, a negative value of (Delta)G indicates a tendency of the reaction to proceed from reactants to products.
Relationships required to evaluate (Delta)G at a given pressure, temperature, and composition of solid and gaseous species are discussed. |
| GEOSCAN ID | 222698 |
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