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How to Say How Much: Amounts and Stoichiometry

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Addison Ault

Department of Chemistry, Cornell College, Mount Vernon, IA 52314-1098

J. Chem. Educ., 2001, 78 (10), p 1347

DOI: 10.1021/ed078p1347

Publication Date (Web): October 1, 2001

Section:

History, Education, and Documentation

Abstract

This paper presents a concise and consistent pictorial representation of the ways by which chemists describe an amount of material and of the conversion factors by which these statements of amount can be translated into one another. The expressions of amounts are mole, grams, milliliters of a pure liquid, liters of solution, liters of a gas at standard and nonstandard conditions, and number of particles. The paper then presents a visual representation or "map" for the solution of the typical stoichiometry problems discussed in general chemistry. You use the map for mole-to-mole and gram-to-gram calculations (or any combination of these), and for limiting reagent and percent yield problems. You can extend the method to reactions that involve solutions or gases and to titration problems. All stoichiometry problems are presented as variations on a central theme, and all problems are reduced to the same types of elementary steps.

Keywords (Audience):

High School / Introductory Chemistry

Keywords (Subject):

Stoichiometry

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This article has been cited by 3 ACS Journal articles (3 most recent appear below).

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