Bell Ringer: Fill in the Blanks
________
______
g/mol
MOLE
____ L/mol
end
Avogadro’s Number
_________ particles/mol
Stoichiometry
Chapter 9
Stoichiometry

Stoichiometry
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Involves the mass relationships between
reactants and products in a chemical reaction
Using a new conversion factor: Mole Ratio
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Think of it like a recipe when baking!!!
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Mole Ratio
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Mole Ratio
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A conversion factor that relates the amount of moles
in a chemical reaction, using the coefficients in a
balanced equation
Example of what a mole ratio looks like
→
2mol Al 2 O3
3mol O2
Find the all of the mole ratios in the following balanced
equations:
1. 2 Al2O3  4 Al + 3 O2 (should have minimum of 3 ratios)

2. 4 NH3 + 6 NO  5 N2 + 6 H2O (should have minimum of 4 ratios)
end
Stoichiometry
To solve:

1.
2.
3.
4.
end
Balance equation
Start dimensional analysis with the number that
is given to you in the problem.
Use the mole ratio conversion factor to convert
from one substance to another. (get this from
the balanced equation)
Convert to the units that the question is asking
for. (use the flow chart from slide 4)
Stoichiometry
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Balance the following:
___KClO3  ___KCl + ___O2
How many moles of KClO3 are needed to
react with 50 mol O2?
If 9 mol of KClO3 are decomposed, how
many moles of KCl are produced?
Stoichiometry

___Na + ___Cl2  ___NaCl

How many grams of NaCl are produced if you
start with 12.5 mol of Na?
If 49.5 g Cl2 are used in the reaction how
many moles of NaCl are produced?
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end
Stoichiometry
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end
___N2(g) + ___H2(g)  ___NH3(g)
If 40grams of H2 are consumed, how many
liters of ammonia are produced?
Assuming 450g of ammonia are produced,
how many grams of N2 would you need to
react to get this amount of product?
Mass-Mass Worksheet
2KClO3 --> 2KCl + 3O2
How many grams of Potassium Chloride are
produced if 25g of Potassium Chlorate
decompose?
Worksheet #2
N2 + 3H2 --> 2NH3
How many grams of Hydrogen are
necessary to react completely with 50g of
Nitrogen in the above reaction?
Complete Entire
Worksheet
Bell Ringer
Volume to Volume
Practice
Volume-Volume Worksheet
N2 + 3H2 --> 2NH3
What volume of Hydrogen is necessary
to react with 5 liters of Nitrogen to
produce ammonia?
Online Stoi Review
Mole- Mole
Mass-Mass
Volume-Volume
Complete Worksheet
Bell Ringer: Stoichiometry
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
___CO2(g) + ___LiOH  ___Li2CO3 + ___H2O
400 L of CO2 are consumed in the reaction. How
many molecules of water are produced? What is
the mass of water?
What would have the mass of the water been?
end
Limiting Reactant
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1 reactant gets used up before the others
Limiting Reactant
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Excess Reactant
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end
Limits the amount of product formed
Completely used up in a reaction
Leftovers after the reaction
Limiting Reactant
To Solve:

1.
2.
3.
4.
end
Choose one of your products to focus on in the
reaction.
Use the mole ratio of the reactants to the the
one product you have choosen.
Convert both reactants to the one product.
The reactant that produced the least amount of
product is your limiting reactant.
Limiting Reactant

3Fe + 4H2O  Fe3O4 + 4H2
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end
If 36.0 g of H2O is mixed with 167 g of Fe, which
is the limiting reactant?
What mass of Fe3O4 is produced?
Worksheet Practice
Percent Yield
Results from an
Experiment
Percent Yield 
Actual Yield
Theoretical Yield
 100
Calculated from
Stoichiometry
end
Percent Yield

C6H6 + Cl2  C6H5Cl + HCl


When 36.8 g of C6H6 combine with excess Cl2 the actual
yield of C6H5Cl is 38.8 g. What is the percent yield of
C6H5Cl?
CO + 2H2  CH3OH

If 75.0 g of CO reacts to produce 68.4 g CH3OH, what is
the percent yield of CH3OH?
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Homework

Complete Packet.

P. 287: (1 & 2)
P. 294 (1 & 2 –only a & c, do not do B)
P. 296 (19 & 20)
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Bell Ringer: Limiting Reactant

Carbon reacts with water to produce
hydrogen gas and carbon monoxide gas

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If 2.40 mol C are exposed to 3.10 mol of water,
what is the limiting reactant?
How many moles of each product are formed?
What mass of each product is formed?
Clicker Review will be based on your Class Average
# 1-15
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