Stoichiometry Chapter 11

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

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

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