http://chemmac1.usc.edu/java/balance/balance.html

Stoichiometry of chemical equations

This java applet check if a chemical reaction is properly balanced.
The equation is given to the applet as a parameter in the web page html code: 

    <applet codebase="http://chemmac1.usc.edu/java/balance/" code="BalanceEq2.class" width="540" height="120">
    <PARAM name="Eq" value="Fe2O3+Al=Al2O3+Fe">
    </applet>
It uses the chemical equation parser for all reactants and products (see applet page)
To do:
put subscripts in equation
give feedback when answer is incorrect
examples: