How many phase-rule variables must be specified to fix the thermodynamic state of each of the following

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How many phase-rule variables must be specified to fix the thermodynamic state of each of the following systems? 

(a). Liquid water in equilibrium with its vapor. 

(b). Liquid water in equilibrium with a mixture of water vapor and nitrogen. 

(c). A three-phase system of a saturated aqueous salt solution at its boiling point with excess salt crystals present.

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Introduction To Chemical Engineering Thermodynamics

ISBN: 9781260597684

9th International Edition

Authors: J.M. Smith, Mark Swihart Hendrick C. Van Ness, Michael Abbott

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