Fenske Equation - Another Form of The Fenske Equation

Another Form of The Fenske Equation

A derivation of another form of the Fenske equation for use in gas chromatography is available on the U.S. Naval Academy's web site. Using Raoult's law and Dalton's Law for a series of condensation and evaporation cycles (i.e., equilibrium stages), the following form of the Fenske equation is obtained:

where:
= number of equilibrium stages
= mole fraction of component n in the vapor phase
= mole fraction of component n in the liquid phase
= vapor pressure of pure component n

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