The thermodynamic functions of real gases

For the second change of state, the initial state consists of the individual pure gases all at the same pressure P and the same temperature T, and the final state is the gas mixture at the same pressure and temperature. This change of state may be expressed as 

Therefore, the change of the Gibbs energy, AGmix, for this change of state is 

The change of the Helmholtz energy, AAmix, is the same as that for the Gibbs energy. The change of the entropy, ASmix, is given by c c 

The change of both the energy, A mix, and the enthalpy, AHmix, is zero. Finally, the change in the chemical potential, Agk ma, is 

8 The thermodynamic functions of real gases The equation of state 

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