Question: A mixture of 4 components (A, B, C, and D) is fed to an equilibrium stage, and two phases I and II leave the stage.

A mixture of 4 components (A, B, C, and D) is fed to an equilibrium stage, and two phases I and II leave the stage. Components A,B, and C are in phase I, and components A,B,C, and D are in phase II. How many phase equilibrium relationships should be included in the analysis of this process? How many material balance equations? If the feed flow rate as well as the mole fractions of all components in the feed are known, what is the DOF

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