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
J. Chem. Educ., 1997, 74 (10), p 1231
DOI: 10.1021/ed074p1231
Publication Date (Web): October 1, 1997

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.

Keywords (Audience):

Upper-Division Undergraduate

Keywords (Domain):

Laboratory Instruction

Keywords (Pedagogy):

Hands-On Learning / Manipulatives

Keywords (Subject):

Liquids
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  • Received: August 03, 2009

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