UNSPECIFIED. (2004) Standard absolute entropies, S-298(O), from volume or density - Part II. Organic liquids and solids. THERMOCHIMICA ACTA, 414 (2). pp. 125-130. ISSN 0040-6031

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Abstract

The standard absolute entropies of many materials are unknown, which precludes a full understanding of their thermodynamic stabilities. We show, for both organic liquids and solids, that entropies are reliably linearly correlated with Volume per molecule, V-m (nm(3) per molecule) (or molar volume, M/rho (cm(3) mol(-1))); thus, permitting simple evaluation of standard entropies (J K-1 mol(-1)) at 298 K. The regression lines generally pass close to the origin, with formulae: For organic liquids: S(298)degrees(l) (J K-1 mol(-1)) = 1133(V-m (nm(3) per molecule)) + 44 or S(298)degrees (l) (J K-1 mol(-1)) = 1.881 [M/rho (cm(3) mol(-1))] + 44 For organic solids: S(298)degrees (s) (J K-1 mol(-1)) = 774(V-m (nm(3) per molecule)) + 57 or S(298)degrees (s) (J K-1 mol(-1)) = 1.285 [M/rho (cm(3) mol(-1))] + 57 These results complement similar studies (by ourselves and others) demonstrating linear entropy-volume correlations for ionic solids (including minerals, simple ionic solids and ionic hydrates and solvates), but are now-for the first time-demonstrated for organic materials. Part I of this series of papers [22] applies a similar analysis to ionic solids. (C) 2003 Elsevier B.V. All rights reserved.

Item Type:	Journal Article
Subjects:	Q Science > QD Chemistry
Journal or Publication Title:	THERMOCHIMICA ACTA
Publisher:	ELSEVIER SCIENCE BV
ISSN:	0040-6031
Date:	27 May 2004
Volume:	414
Number:	2
Number of Pages:	6
Page Range:	pp. 125-130
Identification Number:	10.1016/j.tca.2003.12.006
Publication Status:	Published
URI:	http://wrap.warwick.ac.uk/id/eprint/8407

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