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.
Michael Blaber, PhD
Florida State Univ.: Stoichiometry: Chemical Formulas and Equations
Determining empirical formula from analytical data, and determing molecular formula from empirical formula, with flow charts and sample calculations.
Clackamas Community College
Clackamas Community College: Molecular Formulas
Discussion of molecular formula and how to determine it from empirical formula. Practice problems are available.
Towson University
Towson University: Determining Formulae
Explanation of how to calculate empirical and molecular formulas.
Crescent Public Schools
The Internet Science Room: Percentage Composition and Empirical Formulas
Students learn how to find percentage composition, the percentage of a formula mass represented by each element. Percentage composition compares the mass of one part of a substance to the mass of the whole.
Iowa State University
Iowa State University: Empirical Formula of a Compound
Use this computer simulation to determine the amount of water in a crystalline solid hydrate.
Frostburg State University
Frostburg State University Chemistry Online: Polyatomic Ions
A good reference page for anyone studying polyatomic ions. Tables included on this page organize polyatomic ions by family and by charge. Information on naming compounds with polyatomic ions is also provided. There is a link to an online...
Chem Tutor
Chem Tutor: Basic Stiochiometry
Detailed discussion of stoichiometry, mols, and percents. Includes examples showing dimensional analysis (factor-lable method) and a link to the mole road map (a diagram which leads one through the stoichiometric problem-solving process).