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  Home > JCE Print > Journal of Chemical Education > Issues > 2001  > August  >
In the Classroom
Applications of the Gibbs-Duhem Equation
P. Nikitas
Laboratory of Physical Chemistry, Department of Chemistry, Aristotle University of Thessaloniki, 54006 Thessaloniki, Greece
Cover
August 2001
Vol. 78 No. 8
p. 1070
Abstract
It is shown that the Gibbs-Duhem equation can be used for the calculation of (i) a partial molar quantity of a binary mixture from measurements of the composition dependence of the corresponding total molar quantity, (ii) the partial molar quantity of a component, say 1, of a binary mixture from measurements of the composition dependence of the corresponding partial molar quantity of component 2, and (iii) the partial vapor pressures from measurements of the liquid-phase composition dependence of the total vapor pressure. All these calculations require a curve-fitting procedure. Using tabulated experimental data the accuracy of the calculated quantities was found to be comparable to the accuracy of the original experimental data.
Supplement
The spreadsheet in Figure 1 and the spreadsheets used for Figure 3 are available as supplemental material.
*  Contents JCE2001p1070W.xls (MS Excel)
*  Download
JCE2001p1070W.zip

JCE2001p1070W.sit
More Information
*  Citation
 Nikitas, P. J. Chem. Educ. 2001 78 1070.
*  Keywords
 Molecular Properties / Structure; Physical Chemistry; Thermodynamics
*  History
 Created:
Last Updated:		 July 10, 2001
August 31, 2005
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