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Reinforced
S.15.C.6 Identify the physical state for each substance in a reaction equation
Reinforced
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Main Standards
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Chapter 9
Stoichiometry
Table of Contents
Section 1 Introduction to Stoichiometry
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Chapter 9
Section 1 Introduction to
Stoichiometry
Objective
• Define stoichiometry.
• Describe the importance of the mole ratio in
stoichiometric calculations.
• Write a mole ratio relating two substances in a
chemical equation.
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Chapter 9
Section 1 Introduction to
Stoichiometry
Stoichiometry Definition
• Stoichiometry is the proportional relationship
between amounts of product and reactant in a
chemical reaction.
• Composition stoichiometry deals with the mass
relationships of elements in compounds.
• Reaction stoichiometry involves the mass
relationships between reactants and products in a
chemical reaction.
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Chapter 9
Visual Concepts
Stoichiometry
Click below to watch the Visual Concept.
http://my.hrw.com/sh/hc6_00303680
Visual Concept
9x/student/ch09/sec01/vc00/hc609_
01_v00fs.htm
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Chapter 9
Section 1 Introduction to
Stoichiometry
Reaction Stoichiometry Problems
Problem Type 1: Given and
unknown quantities are amounts
in moles.
Amount of given
substance (mol)
Problem Type 2: Given is an
amount in moles and unknown is
a mass
Amount of given
substance (mol)
Amount of unknown
substance (mol)
Amount of unknown
substance (mol)
Mass of unknown
substance (g)
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Chapter 9
Section 1 Introduction to
Stoichiometry
Reaction Stoichiometry Problems, continued
Problem Type 3: Given is a
mass and unknown is an amount
in moles.
Mass of given
substance (g)
Amount of given
substance (mol)
Amount of unknown
substance (mol)
Problem Type 4: Given is a mass
and unknown is a mass.
Mass of a given substance (g)
Amount of given
substance (mol)
Amount of unknown
substance (mol)
Mass of unknown
substance (g)
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Chapter 9
Section 1 Introduction to
Stoichiometry
Mole Ratio
• A mole ratio is a conversion factor that relates the
amounts in moles of any two substances involved in a
chemical reaction
Example:
2Al2O3(l)  4Al(s) + 3O2(g)
Mole Ratios: 2 mol Al2O3
4 mol Al
,
2 mol Al2O3
3 mol O2
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, 4 mol Al
3 mol O2
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Chapter 9
Section 1 Introduction to
Stoichiometry
Converting Between Amounts in Moles
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Chapter 9
Section 1 Introduction to
Stoichiometry
Stoichiometry
Calculations
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Chapter 9
Visual Concepts
Molar Mass as a Conversion Factor
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Visual Concept
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Chapter 9
Notes 9.1
• Molar Mass is the mass, in grams of one mole of a
substance.
• Examples: 1 mole of Al2O3 = 101.96 g
• __________
1 mol Al
• 26.98 g Al
__________
32.00 g O2
1 mol O2
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Chapter 9
Section Review 8.1 pg. 301
• Complete problems #2a, 3 & 4
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Chapter 9
ANSWERS
Section Review 8.1 pg. 301
• Complete problems #2a, 3 & 4
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Online Self-Check Quiz
Complete the online Quiz and record answers.
Ask if you have any questions about your
answers.
click here for online Quiz 9.1
(7 questions)
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Section 9.1: Introduction to Stoichiometry
Stoichiometry
Chemistry Mole
Molar Mass
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