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WorksheetsChemistry Stoichiometry Limiting Excess Reactant and Percent Yield
Total questions: 22
Worksheet time: 2hrs 18mins
Name
Class
Date
1.
What is the limiting reactant if 10 moles of NH3 react with 30.0 moles of NO?
4NH3+6NO --> 5N2 + 6H2O
4NH3+6NO --> 5N2 + 6H2O
a)
NH3
b)
NO
c)
N2
d)
water
2.
The ____________ is the ratio of the actual yield to the theoretical yield that demonstrates the efficiency of the reaction.
a)
theoretical yield
b)
percent yield
c)
actual yield
d)
product
3.
3KOH + H3PO4 → K3PO4 + 3H2O
Calculate the theoretical mass (g) of K3PO4 when 100. g KOH and 250. mL of 3.30M H3PO4 react.
Calculate the theoretical mass (g) of K3PO4 when 100. g KOH and 250. mL of 3.30M H3PO4 react.
a)
5.28 g K3PO4
b)
175 g K3PO4
c)
1130 g K3PO4
d)
126 g K3PO4
4.
Theoretical yield = 73g
Actual yield = 62g
Calculate the percent yield.
Actual yield = 62g
Calculate the percent yield.
a)
1.16%
b)
116%
c)
85%
d)
76%
5.
The limiting reactant
a)
slows the reaction down
b)
is used up first
c)
is the reactant that is left over
d)
controls the speed of the reaction
6.
If a chemist calculates the maximum amount of product that could be obtained in a chemical reaction, he or she is calculating the
a)
theoretical yield
b)
mole ratio
c)
actual yield
d)
percentage yield
7.
When 12 moles of O2 reacts with 1.1 mole of C10H8 what is the limiting reactant? C10H8 + 12 O2 --> 10 CO2 + 4 H2O
a)
Oxygen
b)
C10H8
c)
Water
d)
Carbon Dioxide
8.
4NH3 + 5O2 --> 4NO + 6H2O
How many grams of NO are formed if 6.30g of ammonia react with 1.80g of oxygen?
How many grams of NO are formed if 6.30g of ammonia react with 1.80g of oxygen?
a)
0.37g
b)
0.045g
c)
1.35g
d)
11.1g
9.
SO2 + PCl5 --> SOCl2 + POCl3
How much SOCl2 is produced when 16.2g SO2 react with 13.7g PCl5?
How much SOCl2 is produced when 16.2g SO2 react with 13.7g PCl5?
a)
7.87g
b)
30.1g
c)
26.4g
d)
19.8g
10.
When does a chemical reaction stop?
a)
When the lab is finished
b)
When the excess reactant is used up
c)
When the limiting reactant is used up
d)
Chemical reactions never stop
11.
Use the equation 2 Al + 3 Cl2 ---> 2 AlCl3. If 2 moles of aluminum and 2 moles of chlorine are reacted, identify the limiting reactant.
a)
AlCl3
b)
Cl2
c)
Al
12.
1 Cheese + 2 Bread --> 1 grilled cheese
How many grilled cheeses can you make with 26 slices of bread and 14 pieces of cheese?
How many grilled cheeses can you make with 26 slices of bread and 14 pieces of cheese?
a)
14
b)
13
c)
26
d)
7
13.
4NH3 + 5O2 --> 4NO + 6H2O
How many grams of NO are formed if 6.30g of ammonia react with 1.80g of oxygen?
How many grams of NO are formed if 6.30g of ammonia react with 1.80g of oxygen?
a)
0.37g
b)
0.045g
c)
1.35g
d)
11.1g
14.
P4 + 6Cl2 --> 4PCl3
The reaction of 75.0g P4 with excess chlorine gas produces 110g PCl3 in lab. Find the theoretical yield and calculate percent yield for the reaction.
The reaction of 75.0g P4 with excess chlorine gas produces 110g PCl3 in lab. Find the theoretical yield and calculate percent yield for the reaction.
a)
78%
b)
64%
c)
27%
d)
33%
15.
Al + HBr --> AlBr3 + H2
Balance the following equation. What is the coefficient for HBr?
Balance the following equation. What is the coefficient for HBr?
a)
2
b)
6
c)
3
d)
1
16.
You need 2 pieces of bread, 1 tablespoon of peanut butter and 2 tablespoons of jelly to make a sandwich. If you have 10 pieces of bread, 4 tablespoons of peanut butter and 20 tablespoons of jelly, what is the limiting reactant?
a)
bread
b)
jelly
c)
peanut butter
d)
sandwich
17.
What is the measured amount of a product obtained from a chemical reaction?
a)
mole ratio
b)
theoretical yield
c)
percentage yield
d)
actual yield
18.
Using the reaction below, determine the percent yield of H2 if you reacted 36.0 g of water with excess iron. The actual yield is 3.60 g H2.
3Fe + 4H2O → Fe3O4 + 4 H2
3Fe + 4H2O → Fe3O4 + 4 H2
a)
112%
b)
89.1%
c)
49.9%
d)
0.891%
19.
Which is the correct mole ratio of K3PO4 to KNO3 represented by the unbalanced equation below:
Mg(NO3)2 + K3PO4 → Mg3(PO4)2 + KNO3
a)
1:1
b)
2:3
c)
1:3
d)
1:2
20.
A reaction was predicted to produce 32.4 grams of a compound. When the product was measured, there were only 26.1 grams made. What is the percent yield?
a)
80.6%
b)
6.3%
c)
24.1%
d)
58.5%
21.
The ____________ is the reactant that is not completely used in a reaction.
a)
excess reactant
b)
limiting reactant
c)
products
d)
balanced chemical equation
22.
What is the correct formula for baking soda?
a)
NaHCO2
b)
NaC2H3O2
c)
NaHCO3
d)
Na2CO3
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