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2004
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Research: Science and Education
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Updated Principle of Corresponding States
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Dor Ben-Amotz and Alan D. Gift
Department of Chemistry, Purdue University, West Lafayette, IN 47907-1393
R. D. Levine
Fritz-Haber Research Center, Hebrew University, Jerusalem 91904, Israel
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January 2004
Vol. 81 No. 1
p. 142
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| Abstract |
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Demonstrating the principle of corresponding states is often the first encounter that a beginning student of physical chemistry has with the analysis of real data. This remarkable reduced representation of fluid thermodynamic properties points to a fundamental link between observable macroscopic behavior and molecular properties. Recently compiled experimental measurements and computer simulations offer an opportunity to demonstrate and explain this intriguing connection. In particular, we show how experimental and theoretical equation of state results may be combined to better illustrate the scaling relationship of real rare gases, diatomics, and methane. We demonstrate the connection between thermodynamic properties and the intermolecular interaction potential and establish a link to gas non-idealities, as expressed by the compressibility factor, Z (= PV/nRT), the second virial coefficient, B(T), and the Boyle temperature, TBoyle (at which the vapor behaves nearly ideally). Conversely, the fact that other fluids, such as He, CO2, HO, and n-butane, do not globally follow the same reduced behavior implies that these molecules have intermolecular interaction potentials of fundamentally different form. Web-based tables and graphs available from the NIST Chemistry WebBook (accessed Aug 2003) offer ample opportunities to reinforce key concepts using numerical examples and homework problems.
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| Supplement |
Additional material, including more specific instructions for using the NIST Chemistry WebBook (accessed Aug. 2003) and sample homework problems are available.
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 Contents |
JCE2004p0142W.doc (Microsoft Word)
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| Download |
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| More Information |
Citation |
Ben-Amotz, Dor; Gift, Alan D.; Levine, R. D. J. Chem. Educ. 2004 81 142.
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Keywords |
Gases; Intermolecular Forces; Liquids; Physical Chemistry; Thermodynamics
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History |
Created:
Last Updated: |
December 8, 2003
February 18, 2005
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| Home > JCE Print > Journal of Chemical Education > Issues >
2004
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January
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142
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