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Chapter 12: Stoichiometry

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Chapter Overview

Stoichiometry is the area of chemistry that involves the calculation of amounts of substances used in a chemical reaction from knowledge of the balanced equation. The simplest stoichiometry problems use only mole-mole ratios from the coefficients of the equation. More advanced problems are two or three steps and involve mole-mass and/or mole-volume calculations in addition to the mole ratio. The limiting reactant in a chemical reaction is the reactant that would run out first during the course of a reaction and thus limit the amount of products that could be formed. The other reactant(s) are called excess reactant(s). The percent yield of a reaction is an indication of how successful a reaction has been and can be calculated from the actual yield and the theoretical yield.

Online Resources

See the following Web sites for appropriate activities:

Pacing the Lessons

Lesson Class Period(s) (60 min)
12.1 Mole Ratios 1
12.2 Stoichiometric Calculations 2
12.3 Limiting Reactant and Percent Yield 2

Chemistry Concepts

The table below matches each lesson from the flexbook to the chemistry concepts.

Flexbook Lesson Chemistry Concepts
12.1 Mole Ratios 12.1 – 12.2
12.2 Stoichiometric Calculations 12.3 – 12.6
12.3 Limiting Reactant and Percent Yield 12.7 – 12.9

Chapter Outline

Chapter Summary

Image Attributions


Difficulty Level:

At Grade


Date Created:

Aug 12, 2014

Last Modified:

Aug 25, 2014
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