Balancing equations websites:

 http://www.wfu.edu/~ylwong/balanceeq/balanceq.html

 http://www.mpcfaculty.net/mark_bishop/balancing_equations_tutorial.htm

 http://richardbowles.tripod.com/chemistry/balance.htm

 http://www.chemistrycoach.com/tutorials-2.htm#Chemical%20Equation:

% composition and empirical and molecular formulas 

http://www.wwnorton.com/chemistry/tutorials/ch4.htm 

http://science.widener.edu/svb/tutorial/percentcompcsn7.html 

http://science.widener.edu/svb/tutorial/empiricalformulascsn7.html 

http://dbhs.wvusd.k12.ca.us/webdocs/Mole/Emiprical-MolecFormulas.html 

http://www.chemistrycoach.com/tutorials-2.htm#Formulas,%20Stoichiometry 

http://www.chemistrycoach.com/tutorials-2.htm#Formulas,%20Stoichiometry

http://chemed.chem.purdue.edu/genchem/probsolv/stoichiometry/molecular1/mf1.0.html 

http://www.chemistrycoach.com/tutorials-2.htm#Formulas,%20Stoichiometry