Transcript u8-2 review and preview for web

Stoichiometry
Chapter 11
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
REVIEW
Conversion Factors
1.
Avogadro’s number and moles


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

2.
Molar mass

3.
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
PREVIEW
Unit Objectives
 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