Here, a practical computer-assisted data processing protocol by using Microsoft Excel Solver is introduced for obtaining the system composition. In the experiment, the compositions of the binary system, determined both from the liquid and the vapor phases at equilibrium, are regarded as the key data in deriving the overall system point in phase diagram. Since liquid-vapor equilibrium is one of the essentials in thermodynamics to design and optimize separation processes, and phase equilibria require a good understanding of phase diagrams, “Constructing Liquid-Vapor Phase Diagram for Two Completely Miscible Components Systems” often serves as a common experiment in physical chemistry course.
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