Stoichiometry Jeopardy
Mass-Mass
Mass-Volume
Percent Yield
Limiting
Reactants
Q $100
Q $100
Q $100
Q $100
Q $100
Q $200
Q $200
Q $200
Q $200
Q $200
Q $300
Q $300
Q $300
Q $300
Q $300
Q $400
Q $400
Q $400
Q $400
Q $400
Q $500
Q $500
Q $500
Q $500
Q $500
“Stoiched” About
Chemistry
Final Jeopardy
$100 Mass-Mass
If 20.0 g of magnesium react with excess
hydrochloric acid, how many grams of magnesium
chloride will be produced?
Mg + HCl -------> MgCI2 + H2
$100 Answer from Mass-Mass
39.2g MgCl2
$200 Mass-Mass
How many grams of aluminum would be
required to produce 550 g of Fe using the
following reaction?
Al + Fe2O3 ------> Fe + Al2O3
$200 Answer from Mass-Mass
265.1g Al
$300 Mass-Mass
What mass of oxygen is needed to completely
react with 84.9 g of Fe according to the
following reaction?
Fe + O2 ----> Fe2O
$300 Answer from Mass-Mass
12.2g O2
$400 Mass-Mass
Sodium oxide reacts with water to produce sodium
hydroxide. What mass of sodium oxide must be
used to produce 275 grams of sodium hydroxide?
$400 Answer from Mass Mass
212.9g Na2O
$500 Mass Mass
When butane, C4H10 burns in oxygen, the products
are carbon dioxide and water. What
mass of carbon dioxide will be produced when 4.42
g of butane is burned in excess
oxygen?
$500 Answer from Mass Mass
13.35g CO2
$100 Mass-Volume
In the following equation, what volume of hydrogen gas
is produced when 135 grams of aluminum are completely
reacted with excess sulfuric acid?
2 Al + 3 H2SO4 -----------> 3 H2
+ Al2(SO4)3
$100 Answer from Mass-Volume
168.6 L H2
$200 Question from Mass-Volume
In the reaction below, how many liters
of ammonia gas are produced when 35 grams of
liquid nitrogen completely react with excess
hydrogen?
N2
+
3H2
---------->
2 NH3
$200 Answer from Mass-Volume
56.0 L NH3
$300 Question from Mass-Volume
What volume of oxygen is produced in the
decomposition reaction of 145.73 g sodium
chlorate ?
NaClO3 
NaCl +
O2
$300 Answer from Mass-Volume
15.3 L O2
$400 Question from Mass-Volume
How many grams of Al2O3 will be formed from 17.4
liters of O2?
Al + O2

Al2O3
$400 Answer from Mass-Volume
58.2 g Al2O3
$500 Question from Mass-Volume
How many liters of carbon dioxide will form from
the combustion 320.0 grams of C5H12 with
excess oxygen?
$500 Answer from Mass-Volume
497.8 L CO2
$100 Question from % Yield
Calculate the theoretical yield of Calcium Oxide if 24.8
grams of Calcium Carbonate decomposes. Calculate
the percent yield if you got 13.1 grams in the laboratory.
CaCO3
→
CaO
+
CO2
$100 Answer from % Yield
94%
$200 Question from % Yield
What is the percent yield if you experimentally produce
3.65 grams of copper when 1.87 grams of Aluminum
reacts with 9.65 grams of Copper (II) Sulfate?
Al
+
CuSO4
→
Cu
+
Al2(SO4)3
$200 Answer from % Yield
95%
$300 Question from % Yield
There are 100.0 grams of each reactant available. Determine
the limiting reactant in this equation.
SO2
+
2NaOH
→
Na2SO3
+
H2O
$300 Answer from % Yield
LR=NaOH
$400 Question from % Yield
Find the theoretical yield of silicon carbide if 50.0
grams of silicon dioxide reacts with 79.1 grams of
Carbon.
SiO2
+
C
→
SiC
+
CO
$400 Answer from % Yield
33.3g SiC
$500 Question from % Yield
What is the percent yield if 155 grams of calcium
carbonate is treated with 250 grams of hydrochloric acid
and 142 grams of calcium chloride is obtained?
CaCO3
+
HCl
→
CaCl2
+
CO2
+
H2O
$500 Answer from % Yield
56.6%
$100 Question from Limiting
Reactants
If 10.4 moles of hydrogen, H2, and 9.1 moles of
oxygen, O2, are placed together in a container and
allowed to react according to the equation. How
many moles of water, H2O, would be produced by
the reaction?
2 H2 + O2  2 H2O
$100 Answer from Limiting
Reactants
10.4 mol H2O
$200 Question from Limiting
Reactants
If 83.7 grams of aluminum, Al, and 195.2 grams of
sulfur, S, are put into a container and allowed to
react according to the above equation, which
substance(s) and how many grams of each would
be present in the container after the reaction is
complete?
2 Al + 3 S  Al2S3
$200 Answer from Limiting
Reactants
LR= Al
$300 Question from Limiting
reacatants
If 609.5 grams of vanadium (II) oxide, VO,
and 832 grams of iron (III) oxide, Fe2O3,
are put into a container and allowed to react
according to the equation above, which
substance(s) and how many grams of FeO would be
present in the container after the reaction is
complete?
2 VO + 3 Fe2O3  6 FeO + V2O5
$300 Answer from Limiting
Reactants
748.6g FeO
$400 Question from Limiting
Reactants
Methyl alcohol (wood alcohol), CH3OH, is produced via the
reaction
CO(g) + 2 H2(g)  CH3OH(l)
A mixture of 1.20 g H2(g) and 7.45 g CO(g) are allowed to
react.
Which reagent is the limiting reagent?
$400 Answer from Limiting
Reactants
8.5g
CH3OH
$500 Question from Limiting
Reactants
A welder has 20.0 moles of acetylene gas (C2H2)
and 10.0 moles of oxygen gas (O2). They
combine
to form water and carbon dioxide. Identify the
limiting reactant. How many moles of carbon
dioxide
gas (CO2) will form?
$500 Answer from Limiting
Reactants
O2 yields 8.0 mol CO2
C2H2 yields 40.0 mol CO2
O2 is the limiting reactant
$100 Question from “Stoiched”
About Chemistry
0.300 moles of bromine gas (Br2) and 0.500 moles of
chlorine gas (Cl2) react to form tribromochlorine (Br3Cl).
How many moles of this product will form?
$100 Answer from “Stoiched”
About Chemistry
0.2 mol Br3Cl
$200 Question from “Stoiched”
About Chemistry
Determine the % yield when 7.80 grams of benzene
(C6H6) burns in oxygen gas to form 3.00 grams
of CO2 gas and water vapor.
$200 Answer from “Stoiched”
About Chemistry
11.5%
$300 Question from “Stoiched”
About Chemistry
25.3 g of magnesium reacts with 44.3 g of copper (II)
nitrate to form copper and magnesium nitrate.
What mass of copper will form? What mass of
reactants will remain unreacted?
$300 Answer from “Stoiched”
About Chemistry
16.Og Cu will form
19.3 g un-reacted reactants
$400 Question from “Stoiched”
About Chemistry
2 NH3 + 2 O2  N2O + 3 H2O
If 80.0 grams of O2 are reacted in the above reaction, how
many grams of N2O will be produced?
$400 Answer from “Stoiched”
About Chemistry
55.2g N2O
$500 Question from “Stoiched”
About Chemistry
Methyl alcohol (wood alcohol), CH3OH, is produced via
the reaction
CO(g) + 2 H2(g)  CH3OH(l)
A mixture of 1.20 g H2(g) and 7.45 g CO(g) are allowed to
react.
• Which reagent is the limiting reagent?
• What is the yield of CH3OH?
[Assume theoretical yield ing is what is wanted
here.]
• How much of the reagent present in excess is left
over?
• Suppose the actual yield is 7.52 g of CH3OH. What is
the % yield?
$500 Answer from “Stoiched”
About Chemistry
Final Jeopardy Question
Silicon nitride (Si3N4), a ceramic, is made by the direct
combination of silicon and nitrogen at high temperature.
How much silicon must react with excess nitrogen to
prepare 125 grams of silicon nitride if the yield of the
reaction is 95%?
Final Jeopardy Answer
70.1g Si