Texas A&M University
Texas A&m: Steps for Determining an Empirical Formula
The steps for determining an empirical formula are listed on this site. Also, it tells how to determine the molecular formula from an empirical formula. Two example problems are worked through step by step.
Texas Instruments
Texas Instruments: Naming Chemical Formulas
This Study Card stack will provide additional review for naming chemical compounds and chemical formulas.
Clackamas Community College
Clackamas Community College: Empirical Formulas
This site presents as explanation for calculating empirical formulas from composition data. Numerous examples are given, along with practice problems.
CK-12 Foundation
Ck 12: Chemistry: Empirical Formula
[Free Registration/Login may be required to access all resource tools.] Covers empirical formula.