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ERIC Number: EJ1062197
Record Type: Journal
Publication Date: 2015-Feb
Pages: 9
Abstractor: As Provided
Reference Count: 48
ISSN: ISSN-0021-9584
Reviewing Some Crucial Concepts of Gibbs Energy in Chemical Equilibrium Using a Computer-Assisted, Guided-Problem-Solving Approach
Borge, Javier
Journal of Chemical Education, v92 n2 p296-304 Feb 2015
G, G°, ?rG, ?rG°, ?G, and ?G° are essential quantities to master the chemical equilibrium. Although the number of publications devoted to explaining these items is extremely high, it seems that they do not produce the desired effect because some articles and textbooks are still being written with some of these quantities that appear to be identical to others. This work attempts to clarify the differences between the six quantities using a guided-problem-solving approach instead of a more conventional expository style. A very simple chemical equilibrium, N[subscript 2]O[subscript 4](g) ? 2NO[subscript 2](g), has been chosen as an example. Furthermore, it has been treated in the simplest possible way (as an ideal gas mixture, to thereby avoid fugacities), because the important issue is to sort out concepts and not get entangled in laborious calculations that many times obscure the didactic objective pursued. It is complemented with a small computational tool (a MATLAB script) to quickly perform calculations and graphs. In addition, the script allows one to analyze interactively (through a user-friendly interface) the disturbances that occur in chemical equilibrium owing to changes in temperature and pressure. An exhaustive review of the literature has also been made to select the most useful sources to study this problem.
Division of Chemical Education, Inc and ACS Publications Division of the American Chemical Society. 1155 Sixteenth Street NW, Washington, DC 20036. Tel: 800-227-5558; Tel: 202-872-4600; e-mail:; Web site:
Publication Type: Journal Articles; Reports - Descriptive
Education Level: Higher Education; Postsecondary Education
Audience: N/A
Language: English
Sponsor: N/A
Authoring Institution: N/A