- Physical Chemistry I
Spring 2012, Unique 52135
Lecture Summary, 13 February 2012
entropy: Today we looked at patterns for the
magnitude of molar entropy for similar compounds at the standard
state. We made a few conclusions:
1) Molar entropy increases with FW
2) Molar entropy increases with additional phase transformations.
3) Molar entropy increases with conformational degrees of freedom from molecular structure.
Microstates: All of this implies that there is a molecular mechanism for entropy. Today we quantified this by defining microstates: experimentally indistinguishable configurations that all lead to a single experimentally distinguishable outcome. The more microstates available to a system, the higher its entropy. A system will move spontaneously in the direction of increasing microstates.