The definition of fugacity involves a calculation subtracting the value of this quantity for an ideal gas from its actual value at the same temperature and pressure.
This quantity is is related to the mole fraction of compounds and temperature-dependent parameters through the Redlich-Kister expansion. The definition of fugacity involves a calculation subtracting the value of this quantity for an ideal gas from its actual value at the same temperature and pressure. For a liquid, the derivative of this quantity with respect to area is directly related to the (*) surface tension. For isothermal, isobaric systems it is always at a local minimum in order for equilibrium to be stable, and the value of this quantity remains constant across a phase transition. For 10 points, name this quantity equal to H minus TS or PV plus the Helmholtz energy.
This quantity is is related to the mole fraction of compounds and temperature-dependent parameters through the Redlich-Kister expansion.
Gibbs free energy [accept Excess Gibbs free energy until "fugacity"]