Conventional Entropies and the Third Law of Thermodynamics©
Theresa Julia Zielinski
Department of Chemistry, Medical Technology, and Physics
Monmouth University
West Long Branch, NJ 07764-1898
United States
mail to: tzielins@monmouth.edu

Todd M. Hamilton
Department of Chemistry
Georgetown College
Georgetown, KY 40324
United States
mail to: Todd_Hamilton@georgetowncollege.edu

In this document, standard molar entropies for several substances are calculated using the Third Law of Thermodynamics and heat capacity data. Students learn a method for fitting a polynomial to the heat capacity values at different temperatures. They also explore the contributions of different phases to the total entropy of a substance by integrating the heat capacity within each phase and adding the individual entropy components together. This document can be used in the standard physical chemistry course, when discussing standard molar entropies and the Third Law of Thermodynamics.
Editor's Commentary
Audiences: Upper-Division Undergraduate
Pedagogies: Computer-Based Learning
Domains: Physical Chemistry
Topics: Mathematics / Symbolic Mathematics, Thermodynamics
File NameDescriptionSoftware TypeSoftware Version
fitting.pdf Curve Fitting with Polynomials Notes
ThirdLaw.pdf Read-Only Document
ThirdLaw.xmcd JCE Computational Document. Requires Mathcad 13 or higher. Mathcad 13
ThirdLawEntropy.zip JCE Archive of Data Files.
JCE JCE Subscribers only: name and password or institutional IP number access required.
Hamilton, T. M.; Zielinski, T. J. J. Chem. Educ. 2009, 86, 1468
Comments to: Todd M. Hamilton at Todd_Hamilton@georgetowncollege.edu
©Copyright 2009 Division of Chemical Education, Inc., American Chemical Society.