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  Home > JCE Print > Journal of Chemical Education > Issues > 2005  > June  >
Information • Textbooks • Media • Resources
JavaScript Programs To Calculate Thermodynamic Properties Using Cubic Equations of State
Patrick J. Barrie
Department of Chemical Engineering, University of Cambridge, Cambridge CB2 3RA, United Kingdom
Cover
June 2005
Vol. 82 No. 6
p. 958
Abstract
Cubic equations of state are widely used by chemists and chemical engineers to predict the thermodynamic properties of both pure substances and mixtures. In particular, they enable predictions concerning the temperature and pressure at which vapor–liquid equilibrium occurs. In this article, two JavaScript programs are described. The first program gives students the choice of five different cubic equations of state and performs calculations for pure substances. The second program predicts vapor–liquid equilibrium for binary mixtures using a choice of three modern equations of state and the van der Waals mixing rules. There are three advantages to using JavaScript and a Web interface for these programs. Firstly, the program contains online theory so that, rather than just calculating the parameter, the program explains how the calculation is being performed. Secondly, virtually all students are familiar with how forms work when they are used on Web pages and so they find the program straightforward to use. Thirdly, the Web interface means that it is easy for a student to vary a parameter and observe its influence on the answer or to repeat a calculation using a different equation of state.
Supplement
These applications and sample problems are available in the JCE WebWare peer-reviewed collection of the JCE Digital Library Only @ JCEOnline.
More Information
*  Citation
 Barrie, Patrick J. J. Chem. Educ. 2005 82 958.
*  Keywords
 Chemical Engineering; Computer-Based Learning; Enrichment / Review Materials; Equilibrium; First-Year Undergraduate / General; Internet / Web-Based Learning; Physical Chemistry; Second-Year Undergraduate; Thermodynamics; Upper-Division Undergraduate
*  History
 Created:
Last Updated:		 April 27, 2005
May 6, 2005
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