|Home||Chapter 3: Stoichiometry: Calculations with Chemical Formulas and Equations|
The chapter begins with an examination of chemical equations and how they are balanced. We will then consider some simple kinds of reactions, including combustion reactions. To gain some understanding of the quantitative significance of chemical formulas and chemical equations, we next consider atomic and formula weights and the mole concept. Finally, we will consider how the mole concept can be used to determine chemical formulas and to determine the relative quantities of reactants and products involved in chemical reactions.
The quantitative nature of chemical formulas and chemical reactions involves an area of study known as stoichiometry (pronounced stoy-key-OM-uh-tree), a name derived from the Greek stoicheion ("element") and metron ("measure"). Stoichiometry is an essential tool in chemistry. Such diverse problems as measuring the concentration of ozone in the atmosphere, determining the potential yield of gold from an ore, and assessing different processes for converting coal into gaseous fuels all involve aspects of stoichiometry. What we learn in this chapter forms a foundation of much of the chemistry that we encounter in later chapters and in the laboratory portion of the course.