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Zeitschrift für Naturforschung A

A Journal of Physical Sciences

Editor-in-Chief: Holthaus, Martin

Editorial Board: Fetecau, Corina / Kiefer, Claus

IMPACT FACTOR 2016: 1.432

CiteScore 2017: 1.30

SCImago Journal Rank (SJR) 2017: 0.403
Source Normalized Impact per Paper (SNIP) 2017: 0.632

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Volume 51, Issue 12


The Rationale of Trouton's Rule and of the Trouton-Hildebrand-Everett Rule

S. R. Logan
Published Online: 2014-06-02 | DOI: https://doi.org/10.1515/zna-1996-1215


In seeking a rational basis for the general rules regarding the enthalpy of vaporisation of a liquid, it is shown that whereas Trouton's Rule is consistent with the assumption that the effective molar volume, v, for translational motion in the liquid is a constant fraction (2 x 10-5) of the molar volume of vapour at 1 atm, the rather better approximation of Trouton, Hildebrand and Everett (THE), which corrects for the effects of varying molecular density in the vapour, re-quires that v be 1.5 cm3 mol-1 for all substances. The introduction of the apparently more reasonable assumption that v is a constant fraction of the molar volume of the liquid, is shown to lead to an expression exhibiting much poorer cor-relation. It thus offers no improvement to Trouton's rule nor to the THE rule.

Keywords: Trouton's rule; The THE rule; Entropy of vaporisation; Translational entropy; Sackur-Tetrode equation

About the article

Received: 1996-10-09

Published Online: 2014-06-02

Published in Print: 1996-12-01

Citation Information: Zeitschrift für Naturforschung A, Volume 51, Issue 12, Pages 1247–1248, ISSN (Online) 1865-7109, ISSN (Print) 0932-0784, DOI: https://doi.org/10.1515/zna-1996-1215.

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© 1946 – 2014: Verlag der Zeitschrift für Naturforschung. This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 3.0 License. BY-NC-ND 3.0

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