S - Stoichiometry (Module Overview)

Stoichiometry

Introduction

In this module, we will take a closer look at the relationship between substances involved in chemical reactions. We will see that products and reactants can be connected by the relative ratios in which they interact. The branch of stoichiometry deals with the calculation of various quantities of reactants or products of a chemical reaction. The word “stoichiometry” itself is derived from two Greek words “stoichion” meaning element and “metry” meaning measure. If you are not comfortable with converting grams to moles using the molar mass of a compound, take time to review these concepts now. You may review your previous tests and quizzes, reading the feedback that your instructor left and working through the problems that you missed. Be sure to clarify any concepts that you are still unsure of with your instructor. We will build upon these foundational concepts in the upcoming lessons.

Having a periodic table handy is always helpful in chemistry. You may always use a periodic table on assignments, quizzes, and tests in this course.

Download the periodic table. Links to an external site.

Module Lessons Preview

In this module, we will study the following topics:

Stoichiometric Calculations

Mass to Mass Practice with Percent Yield

Limiting Reactants

Combustion Lab

Key Terms

Stoichiometry - Calculation of the quantities of reactants and products in a chemical reaction.

Mole ratio - Tells you the relative amounts of reactants and products in a chemical reaction.

Actual yield - Mass of product obtained from a chemical reaction.

Theoretical yield - Amount of product stoichiometrically predicted to be present when a limiting reactant is used up.

Percent yield - Actual yield of a chemical reaction, expressed as a percentage of the theoretical yield.

Limiting reactant - The reactant that is used up completely in a reaction, limiting further chemical change.

Excess reactant - The reactant that is left over in a chemical reaction.

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