1. Stoichiometry
Chapter 11

2. Chemical Reactions/Equations
REVIEW
Chemical Reactions/Equations
Reactant + Reactant → Product + Product
Balanced chemical equations are written to show chemical changes taking place
Balanced chemical equations reflect the Law of Conservation of Mass
Coefficients balance chemical equations and indicate the relative amounts of substances

3. Conversion Factors REVIEW Avogadro’s number and moles Molar mass
1 mol = 6.02 x 1023 representative particles
Representative particles:
Atoms – element from periodic table
Ions – charged atom (due to loss/gain of e–)
Formula units – ionic compound
Molecules – covalent compound
Molar mass
1 mol =  g of substance
where  = (atomic mass × subscript)
Mole ratio of element to compound
1 mol compound =  mol element
where  = subscript of element in compound

4. Unit Objectives PREVIEW
Interpret chemical equations in terms of particles, moles, and mass
Write mole ratios from balanced equations
Calculate number of moles and mass of a reactant or product when given number of moles or mass of another reactant or product
Identify limiting reactants in chemical reactions
Determine percent yield of chemical reactions