Le Chatelier's Principle

The applet below illustrates Le Chatelier's principle. The steam reforming reaction in coal gasification is used as an example.

C (s) + H2O (g) H2 (g) + CO (g)

This reaction is endothermic; the standard enthalpy of reaction is 131 kJ/mole at 298 K.

The applet allows the user to specify the initial amounts of carbon, water vapor, hydrogen gas, and carbon monoxide as well as the system temperature and volume.

For a given set of conditions, the applet will calculate the equilibrium solution for the system. The equilibrium concentrations and number of moles are displayed. A bar is also used to graphically display these values. The red bar represents the amount (moles) of the component, and the blue bar represents the equilibrium concentration of the component. The red bar (amount) uses a linear scale, whereas the blue bar (concentration) used a logarithmic scale.

The equilibrium solution is updated immediately for each change in initial conditions. This behavior allows one to readily see how a change in conditions produces changes in the final equilibrium state.

Applet Name: lechatelier.LeChatelier.class
Archive: lechatelier.jar
Version: 0.1 (July 1998)

The beynon.class applet was written by David N. Blauch (© Copyright 1998-1999 Davidson College).
Conditions of Use

This applet is still under development; additional refinements will be forthcoming. Known problems and the revision history are listed at the bottom of this page. Please send feedback on performance and information on problems to David N. Blauch. This applet requires a Java-enabled browser that supports Java 1.1. Netscape Navigator 4.04 or later (with the JDK update) and Internet Explorer 4.1 provide such support.

Please let me know how you like this applet. If you encounter any bugs or errors, please provide me with the specific details. I would also appreciate any suggestions for improvements.

David N. Blauch; dablauch@davidson.edu

© Davidson College, July 1998