s1. The Clapeyron equation DOES NOT apply to second-order phase transitions. Nevertheless, there are two analogous...
3. In a second-order phase transition, there is no difference in entropy or volume between the two phases and therefore the Clausius-Clapeyron equation cannot be applied. Two Ehrenfest equations can, however, be found. They follow from the the equality in entropy or volume across the phase transition, and they relate dp/dT to differences in α and C, or K between the two phases (a) By setting dSdS2, find dp/dT in terms of the differences in a and Cp between the...
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The Gibbs function of a thermodynamic system is defined by G H- TS. If the system is consisting of two phases 1 and 2 of a single substance and maintained at a constant temperature and pressure, the equilibriunm condition for the coexistence of these two phases is that the specific Gibbs functions are equal Consider now a first-order phase change between the phase 1 and the phase 2. At the phase boundary, the equilibrium condition for the...