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Interpretation of Fusion and Vaporisation Entropies for Various Classes of Substances, with a Focus on Salts
Umeå University, Faculty of Science and Technology, Department of Chemistry.
2014 (English)In: Journal of Chemical Thermodynamics, ISSN 0021-9614, E-ISSN 1096-3626, Vol. 70, no March 2014, 207-2013 p.Article in journal (Refereed) Published
Abstract [en]

Entropies of fusion and vaporisation of a variety of elements and compounds have been derived from literature data. Fusion entropies range from low values for metals and certain cyclic hydrocarbons (e.g. cyclopentane) through modest values for salts to high values for materials undergoing drastic rearrangement or disentanglement such as aluminium chloride and n-alkanes. Entropies of vaporisation for most substances are close to the Trouton’s Law value of ∼100 J deg.-1 mol.-1, with low values for species which associate on boiling (e.g. acetic acid) and higher values signifying simple dissociation (e.g. nitrogen tetroxide) or total decomposition (e.g. some ionic liquids). The nature of inorganic and semi-organic salts in all 3 phases is discussed.

Place, publisher, year, edition, pages
Elsevier, 2014. Vol. 70, no March 2014, 207-2013 p.
Keyword [en]
Entropy, Thermodynamics, Ionic liquids, Trouton’s Law, Phase transition
National Category
Chemical Sciences
URN: urn:nbn:se:umu:diva-83189DOI: 10.1016/j.jct.2013.10.006ISI: 000328733700024OAI: diva2:665761
Available from: 2013-11-20 Created: 2013-11-20 Last updated: 2014-01-23Bibliographically approved

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Driver, Gordon W.
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