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Unformatted text preview: es independently. The other variable is then determined by the equilibrium condition. When three phases are in equilibrium, as at the triple point, the number of degrees of freedom drops to zero. Therefore, the triple point is a unique point for the system. In some cases, as in the case of sulfur, multiple triple points are present (see Fig. 6.1). Each of these are unique points with zero degree of freedom. Components: Determining the number of components in a system is not a trivial task. We may make up a formula for this as follows: c = n – e – o, where c is the number of components, n is the number of chemical species present, e is the number of equilibria between them, and o represents any other relationships that may determine the relative amount of one species with respect to another. See Section 6.1 to see applications of these ideas. Examples: 6.1, 6.2, Problems: 6.1, 6.3, 6.4–6.6. 6.3. Binary systems involving vapor: Liquid-vapor systems consisting of two components are commonly represented in pressure-composition diagrams at fixed temperature, or temperature-composition di...
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This document was uploaded on 02/28/2014 for the course CHEM 311 at LA Tech.

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