In most cases in RD equations (4.4) and (4.5) are applied to all components of the gas and the liquid phase respectively. This leads to the well-known extended form of

Raoult's law for the phase equilibrium between a liquid phase ' and a gas phase " (f )

Ps <?sexp vidP x; y; = pxi <p; i = 1...N (4-10)

Vs J

or, neglecting gas-phase non-idealities and the pressure dependence of the liquidphase chemical potential

Once the choice regarding the description of the chemical potential is made, not only the working equations for the phase equilibrium, such as equation (4.11), are fixed but also those for the chemical equilibrium. For instance, insertion of equation (4.5) into equation (4.3) leads after some rearrangement to the following, thermodynamically consistent form for the chemical equilibrium constant of reaction r

with

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