The first term in the virial expansion for it is RT times the natural logarithm of pressure.  
The first term in the virial expansion for it is RT times the natural logarithm of pressure.  At constant temperature and pressure, chemical equilibrium requires that this quantity is at a minimum.  The change in this quantity is proportional to the natural logarithm of the equilibrium constant and it is defined as enthalpy minus temperature multiplied by entropy.   FTP, identify this thermodynamic state function named for its American formulator.
The first term in the virial expansion for it is RT times the natural logarithm of pressure.  
Gibbs free energy (prompt on "G")