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  Home > JCE Print > Journal of Chemical Education > Issues > 1997  > October  >
In the Laboratory
Determination of Enthalpy of Vaporization Using a Microwave Oven
Alvin P. Kennedy Sr.
Department of Chemistry, North Carolina A&T State University, Greensboro, NC 27411
Cover
October 1997
Vol. 74 No. 10
p. 1231
Abstract
A simple and quick experiment was developed to determine the enthalpy of vaporization of polar solvents at elevated pressures and temperatures. The liquid-vapor phase curve was determined by heating a polar solvent in a microwave oven under constant volume conditions. The solvent was rapidly heated to a safe elevated temperature and pressure in the microwave oven. Then the pressure and temperature were measured simultaneously during the near-equilibrium conditions which occur under thermal cooling. From this data the liquid-vapor phase curve was constructed. The results agree to within 5% of published high pressure data.
More Information
*  Citation
 Kennedy Sr., Alvin P. J. Chem. Educ. 1997 74 1231.
*  Keywords
 Laboratory, Physical Chemistry, Liquids, Phase Transitions/Diagrams, Thermodynamics, and Undergraduate Research
*  History
 Created:
Last Updated:		 July 27, 1999
June 23, 2005
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