CHAPTER 7

Formula Calculations

General Information
- Atomic, Molecular and Formula Masses -Tutorial by David Dice
- THE MOLE & Chemical Formulas - Review of the mole with sample empirical & molecular formula problems (Gwen Sibert, Roanoke Valley Govenor's School, VA).
- Guide Sheet for Mole Problems - Concise instructions for solving various types of problems (molar mass, percentage composition, empirical formula, molecular formula) (Gwen Sibert, Roanoke Valley Govenor's School, VA).
- Stoichiometry (part 2) - Molecular Mass, The Mole, Balancing Chemical Equations, Stoichiometric Calculations Using Balanced Equations AND Stoichiometry (part 3) - Limiting Reactant Problems, Mass Relationships in Chemical Formulas (Percentage Composition, Empirical and Molecular Formulas)(CHEM 12, PSU York Campus).
- Molar Stoichiometry - Discusses moles of molecules, percentage composition, empirical formula, elemental composition of compounds and molecular formula of a compound; sample problems (Dr. James A. Plambeck, University of Alberta).
- Molecular Weight/ Percentage Calculator - JavaScript experimental calculator for determining the molecular weight and the percentage composition; nice visual screen for calculator; need browser that suports JavaScript.

Formula Masses
- Molecular Weight - Basic concept with sample problems, a review section, and practice problems (with link to answers) (ChemTeam, Diamond Bar High School).
- Formula Mass Calculator- Experimental calculator maintained by David Dice; type in formula and it calculates molar mass (David Dice)
Percent Composition
- Percent Composition: Part One AND Part Two - Basic concept with sample problems and practice problems (with link to answers) (ChemTeam, Diamond Bar High School).
- Percentage Composition Calculator-Experimental calculator maintained by David Dice; type in formula and it calculates the percentage composition of the compound.
The Mole
- The Mole Table of Contents - Links to sections on the mole and molar masses (ChemTeam, Diamond Bar High School, CA).
- Mole: Amount of Substance - Discusses the concept of the mole (Dr. James A. Plambeck, Univ. of Alberta).
- The Mole - Describes the mole in easy to understand terms (Mark's Chemistry Tutor).
- Article by Avogadro - Essay on a Manner of Determining the Relative Masses of the Elementary Molecules of Bodies, and the Proportions in Which They Enter Into These Compounds by Lorenzo Romano Amadeo Carlo Avogadro, Journal de physique, 73: 58-76 (1811); translation from Alembic Club Reprints, No.4.
Empirical Formulas/Molecular Formulas
- Empirical Formulas: Part I - A Simple Rhyme for a Simple Formula by Joel S. Thompson, Journal of Chemical Education, Vol. 65, No. 8, August 1988, p. 704. AND Part 2 - use of the rhyme to solve problems (ChemTeam, Diamond Bar High School).
- Types of Chemical Formulas - Discussion of empirical, molecular and structural formulas (Ralph Logan, Dallas County Community College District, North Lake College).
- Determination of Formulas - Instructions on how to work empirical and molecular formula problems (Ralph Logan, Dallas County Community College District, North Lake College).