At equilibrium we have rg 0 which leads to rg rt

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Unformatted text preview: inimum of G). We now use the expression derived in the previous chapter, which relates the chemical potential of a substance in a mixture to that of the corresponding pure component. If the substance A of interest is an ideal gas existing in the mixture under a partial pressure PA, we wrote: µA (PA, T) = µA (P , T) + RT ln(PA / P ) ∅ 191 ∅ ∅ If the substance A of interest is a real gas existing in the mixture under a partial fugacity fA, we wrote: µA (fA, T) = µA (P , T) + RT ln(fA / P ) ∅ ∅ ∅ If the substance A of interest is a pure solid or liquid at pressure P, we write: µA (P, T) = µA (P , T) + Vm (P - P ) which in general can be ∅ ∅ ∅ approximated by µA (P , T) for routinely accessible pressures (since the ∅ ∅ molar volume of liquids or solids is usually much smaller than that of gases and the term Vm (P - P ) is typically small enough to be neglected). ∅ In all...
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