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 2 Ideal Stoichiometric Calculations
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Chapter 9
Section 2 Ideal Stoichiometric
Calculations
Objective
• Calculate the amount in moles of a reactant or a
product from the amount in moles of a different
reactant or product.
• Calculate the mass of a reactant or a product from the
amount in moles of a different reactant or product.
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Chapter 9
Section 2 Ideal Stoichiometric
Calculations
Objectives, continued
• Calculate the amount in moles of a reactant or a
product from the mass of a different reactant or
product.
• Calculate the mass of a reactant or a product from the
mass of a different reactant or product.
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Chapter 9
Section 2 Ideal Stoichiometric
Calculations
Conversions of Quantities in Moles
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Chapter 9
Visual Concepts
Conversion of Quantities in Moles
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Visual Concept
student/ch09/sec02/vc00/hc609_02_v00
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Chapter 9
Section 2 Ideal Stoichiometric
Calculations
Solving
Mass-Mass
Stoichiometry
Problems
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Chapter 9
Section 2 Ideal Stoichiometric
Calculations
Conversions of Quantities in Moles, continued
Sample Problem A
In a spacecraft, the carbon dioxide exhaled by astronauts
can be removed by its reaction with lithium hydroxide,
LiOH, according to the following balanced chemical
equation.
CO2(g) + 2LiOH(s) Li2CO3(s) + H2O(l)
How many moles of lithium hydroxide are required to react
with 20 mol CO2, the average amount exhaled by a
person each day?
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Chapter 9
Section 2 Ideal Stoichiometric
Calculations
Conversions of Quantities in Moles, continued
Sample Problem A Solution
CO2(g) + 2LiOH(s) Li2CO3(s) + H2O(l)
Given: amount of CO2 = 20 mol
Unknown: amount of LiOH (mol)
Solution:
mol ratio
mol LiOH
mol CO2
mol LiOH
mol CO2
2 mol LiOH
20 mol CO2
40 mol LiOH
1 mol CO2
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Chapter 9
Practice problems pg. 306
• Write the balanced equation for practice problems pg.
306 and answer the question in your notes.
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Chapter 9
ANSWERS
Practice problems pg. 306
• Write the balanced equation for practice problems pg.
306 and answer the question in your notes.
Make sure you understand why.
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Chapter 9
Section 2 Ideal Stoichiometric
Calculations
Conversions of Amounts in Moles to Mass
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Chapter 9
Section 2 Ideal Stoichiometric
Calculations
Solving Stoichiometry
Problems with Moles
or Grams
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Chapter 9
Section 2 Ideal Stoichiometric
Calculations
Conversions of Amounts in Moles to Mass,
continued
Sample Problem B
In photosynthesis, plants use energy from the sun to
produce glucose, C6H12O6, and oxygen from the
reaction of carbon dioxide and water.
What mass, in grams, of glucose is produced when
3.00 mol of water react with carbon dioxide?
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Chapter 9
Section 2 Ideal Stoichiometric
Calculations
Conversions of Amounts in Moles to Mass, continued
Sample Problem B Solution
Given: amount of H2O = 3.00 mol
Unknown: mass of C6H12O6 produced (g)
Solution:
Balanced Equation: 6CO2(g) + 6H2O(l) C6H12O6(s) + 6O2(g)
mol ratio
mol H2O
3.00 mol H2O
mol C6H12O6
mol H2O
1 mol C6H12O6
6 mol H2O
molar mass factor
g C6H12O6
mol C6H12O6
g C6H12O6
180.18 g C6H12O6
1 mol C6H12O6
=
90.1 g C6H12O6
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Chapter 9
Practice problems pg. 308
• Write the balanced equation for practice problems pg.
308 #1-2 and answer the question in your notes.
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Chapter 9
ANSWERS
Practice problems pg. 308
• Write the balanced equation for practice problems pg. 308
#1-2 and answer the question in your notes.
Make sure you understand why.
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Chapter 9
Section 2 Ideal Stoichiometric
Calculations
Conversions of Mass to Amounts in Moles
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Chapter 9
Visual Concepts
Mass and Number of Moles of an Unknown
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Visual Concept
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Chapter 9
Section 2 Ideal Stoichiometric
Calculations
Conversions of Mass to Amounts in Moles,
continued
Sample Problem D
The first step in the industrial manufacture of nitric acid
is the catalytic oxidation of ammonia.
NH3(g) + O2(g) NO(g) + H2O(g) (unbalanced)
The reaction is run using 824 g NH3 and excess
oxygen.
a. How many moles of NO are formed?
b. How many moles of H2O are formed?
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Chapter 9
Section 2 Ideal Stoichiometric
Calculations
Conversions of Mass to Amounts in Moles, continued
Sample Problem D Solution
Given: mass of NH3 = 824 g
Unknown: a. amount of NO produced (mol)
b. amount of H2O produced (mol)
Solution:
Balanced Equation: 4NH3(g) + 5O2(g) 4NO(g) + 6H2O(g)
molar mass factor
a.
b.
g NH3
mol NH3
g NH3
mol NH3
g NH3
g NH3
mol ratio
mol NO
mol NH3
mol NO
mol H2O
mol H2O
mol NH3
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Section 2 Ideal Stoichiometric
Calculations
Chapter 9
Conversions of Mass to Amounts in Moles,
continued
Sample Problem D Solution, continued
molar mass factor
a. 824 g NH3
b. 824 g NH3
1 mol NH3
17.04 g NH3
1 mol NH3
17.04 g NH3
mol ratio
4 mol NO
48.4 mol NO
4 mol NH3
6 mol H2O
4 mol NH3
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72.5 mol H2O
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Chapter 9
Practice problems pg. 309
• Write the balanced equation for practice problems pg. 309
#1-2 and answer the question in your notes.
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Chapter 9
ANSWERS
Practice problems pg. 309
• Write the balanced equation for practice problems pg. 309
#1-2 and answer the question in your notes.
Make sure you understand why.
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Chapter 9
Section 2 Ideal Stoichiometric
Calculations
Mass-Mass to Calculations
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Chapter 9
Visual Concepts
Mass-Mass Calculations
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Visual Concept
dent/ch09/sec02/vc02/hc609_02_v02fs.htm
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Chapter 9
Section 2 Ideal Stoichiometric
Calculations
Solving Mass-Mass Problems
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Chapter 9
Section 2 Ideal Stoichiometric
Calculations
Mass-Mass to Calculations, continued
Sample Problem E
Tin(II) fluoride, SnF2, is used in some toothpastes. It is
made by the reaction of tin with hydrogen fluoride
according to the following equation.
Sn(s) + 2HF(g) SnF2(s) + H2(g)
How many grams of SnF2 are produced from the
reaction of 30.00 g HF with Sn?
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Chapter 9
Section 2 Ideal Stoichiometric
Calculations
Mass-Mass to Calculations, continued
Sample Problem E Solution
Given: amount of HF = 30.00 g
Unknown: mass of SnF2 produced (g)
Solution:
molar mass factor
mol ratio
molar mass factor
mol SnF2
g SnF2
mol HF
g HF
g SnF2
g HF
mol HF
mol SnF2
1 mol SnF2
156.71 g SnF2
1 mol HF
g HF
20.01 g HF
2 mol HF
1 mol SnF2
= 117.5 g SnF2
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Practice Problems p.311 #1-3
Chapter 9
• Write a balanced equation before answering
questions.
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Practice Problems p.311 #1-3 ANSWERS
Chapter 9
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Chapter 9
Section 2 Ideal Stoichiometric
Calculations
Solving Various Types of Stoichiometry Problems
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Chapter 9
Section 2 Ideal Stoichiometric
Calculations
Solving Various Types of Stoichiometry Problems
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Chapter 9
Section 2 Ideal Stoichiometric
Calculations
Solving Volume-Volume
Problems
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Chapter 9
Section 2 Ideal Stoichiometric
Calculations
Solving Particle Problems
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Chapter 9
Visual Concepts
Ideal Stoichiometric Calculations
Click below to watch the PROBLEM ACTIVITIES
CALCULATING MOLES REACTED
MASS TO MOLES PROBLEM
MOLES TO MASS PROBLEM
MOLES TO MASS #2
MASS TO MASS PROBLEM
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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 9.2
(7 questions)
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