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  Home > JCE Print > Journal of Chemical Education > Issues > 2005  > July  >
In the Laboratory
Enthalpy of Vaporization by Gas Chromatography. A Physical Chemistry Experiment
Herbert R. Ellison
Department of Chemistry, Wheaton College, Norton, MA 02766
Cover
July 2005
Vol. 82 No. 7
p. 1086
Abstract
A laboratory experiment using gas–liquid chromatography to measure enthalpies of vaporization of very small quantities of organic compounds is presented. Students were given either a solid or liquid that they dissolved in methylene chloride and injected into a gas chromatograph. Retention times of air and the sample were measured at a series of temperatures. Plots of ln(k′/T) versus 1/T, where k′ is the partition or capacity factor, were linear and the slopes yield values of ΔvapH°. Students became aware of some of the thermodynamic factors involved in the separation of compounds by gas chromatography.
Supplement
Instructions for the students and notes for the instructor are available.
*  Contents JCE2005p1086W.doc (Microsoft Word)
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JCE2005p1086W.pdf

JCE2005p1086W.zip
More Information
*  Citation
 Ellison, Herbert R. J. Chem. Educ. 2005 82 1086.
*  Keywords
 Chromatography; Gas Chromatography; Hands-On Learning / Manipulatives; Instrumental Methods; Laboratory Instruction; Physical Chemistry; Physical Properties; Thermodynamics; Upper-Division Undergraduate
*  History
 Created:
Last Updated:		 May 31, 2005
June 8, 2005
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