CH353 - Physical Chemistry I
Spring 2013, Unique 52575

Lecture Summary, 8 February 2013

Entropy based on configurations:  Today we continued our discussion of entropy based on the number of configurations available to a thermodynamic system.  We derived an expression for increasing entropy with increasing volume.  We also saw explicitly that the third law of thermodynamics is a direct consequence of Boltzmann's formulation for entropy.  At 0 K, a perfectly pure crystalline substance has only one possible configuration of the atoms in the crystal, and therefore the molar entropy of the system is 0.