IGNOU BPHCT 135 2026 - Derive Clausius-Clayperon equation of phase transition. Draw phase dia

Question

Derive Clausius-Clayperon equation of phase transition. Draw phase diagram of water.

19 Jan 2026

Answer :

Word Count : 273

During a phase transition, such as between liquid and vapor, the system is in equilibrium when the chemical potentials of the two phases are equal. Let us consider a substance undergoing a phase change at temperature (T) and pressure (P). The Gibbs free energy per mole (G) satisfies (G_1 = G_2) for the two phases. For an infinitesimal change in pressure and temperature along the coexistence curve, the differential of Gibbs free energy is (dG = -S,dT + V,dP), where (S) is the molar entropy and (V) is the molar volume. For both

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