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The Chemical Educator

ISSN: 1430-4171 (electronic version)

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Abstract Volume 11 Issue 6 (2006) pp 380-382

Stoichiometric Calculations Using Equivalent Molar Expressions

Lillian Bird

Department of Chemistry, University of Puerto Rico at Río Piedras, PO Box 23346, San Juan, PR 00931-3346,
Received January 26, 2006. Accepted June 23, 2006.

Published online: 7 November 2006

Abstract. Stoichiometry problems may be readily solved by using appropriate molar expressions for the chemical substances being considered and by making students aware that any two molar expressions for the reaction components divided by their respective coefficient in the balanced chemical equation are mathematically equivalent. Molar expressions for substances in the solid, liquid, solution, and gas phases are considered. The approach is also applied to other extensive properties related to a chemical equation.

Key Words: In the Classroom; general chemistry; stoichiometry

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Issue date: December 1, 2006

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