Stoichiometry: Calculations with Chemical Formulas and Equations
[Pages:74]Chemistry, The Central Science, 11th edition Theodore L. Brown, H. Eugene LeMay, Jr.,
and Bruce E. Bursten
Chapter 3 Stoichiometry: Calculations with Chemical Formulas and Equations
John D. Bookstaver St. Charles Community College
Cottleville, MO
Stoichiometry
? 2009, Prentice-Hall, Inc.
Law of Conservation of Mass
"We may lay it down as an incontestable axiom that, in all the operations of art and nature,
nothing is created; an equal amount of matter exists both before and after the experiment. Upon this principle, the whole art
of performing chemical experiments depends."
--Antoine Lavoisier, 1789
Stoichiometry
? 2009, Prentice-Hall, Inc.
Chemical Equations
Chemical equations are concise representations of chemical reactions.
Stoichiometry
? 2009, Prentice-Hall, Inc.
Anatomy of a Chemical Equation
CH4 (g) + 2 O2 (g)
CO2 (g) + 2 H2O (g)
Stoichiometry
? 2009, Prentice-Hall, Inc.
Anatomy of a Chemical Equation
CH4 (g) + 2 O2 (g)
CO2 (g) + 2 H2O (g)
Reactants appear on the left side of the equation.
Stoichiometry
? 2009, Prentice-Hall, Inc.
Anatomy of a Chemical Equation
CH4 (g) + 2 O2 (g)
CO2 (g) + 2 H2O (g)
Products appear on the right side of the equation.
Stoichiometry
? 2009, Prentice-Hall, Inc.
Anatomy of a Chemical Equation
CH4 (g) + 2 O2 (g)
CO2 (g) + 2 H2O (g)
The states of the reactants and products are written in parentheses to the right of each compound.
Stoichiometry
? 2009, Prentice-Hall, Inc.
Anatomy of a Chemical Equation
CH4 (g) + 2 O2 (g)
CO2 (g) + 2 H2O (g)
Coefficients are inserted to balance the equation.
Stoichiometry
? 2009, Prentice-Hall, Inc.
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