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WorksheetsChem Stoichiometry Percent Yield
Total questions: 15
Worksheet time: 4hrs 45mins
Name
Class
Date
1.
When reacting Na with Cl2, we calculated that the theoretical yield should be 12.5 grams. Our actual yield was 13.0 grams. What is the percent yield?
a)
100%
b)
104%
c)
96%
d)
1.04
2.
CH4 + 2O2 → CO2 + 2H2O
24 grams of CH4 was added to the above reaction. Calculate the theoretical yield of CO2.
24 grams of CH4 was added to the above reaction. Calculate the theoretical yield of CO2.
a)
66 grams
b)
132 grams
c)
33 grams
d)
8.72
3.
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%
4.
Zn + 2HCl → ZnCl2 + H2
15 grams of HCl should theoretically produce 0.42 grams of H2. The reaction actually produced 0.15 grams of H2. What is the percent yield of H2?
15 grams of HCl should theoretically produce 0.42 grams of H2. The reaction actually produced 0.15 grams of H2. What is the percent yield of H2?
a)
2.8%
b)
280%
c)
1%
d)
36%
5.
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%
6.
11.
LiOH + KCl → LiCl + KOH
b) I actually produced 6 grams of lithium chloride and I began this reaction with 20.0 grams of lithium hydroxide. What is my percent yield?
a)
16.9%
b)
5.91%
c)
1.88%
d)
12.3%
7.
13.
Be + 2 HCl → BeCl2 + H2
My theoretical yield of beryllium chloride was 10.7 grams. If my actual yield was 4.5 grams, what was my percent yield?
Be + 2 HCl → BeCl2 + H2
My theoretical yield of beryllium chloride was 10.7 grams. If my actual yield was 4.5 grams, what was my percent yield?
a)
42.1 %
b)
2.38 %
c)
1.24 %
d)
27.2 %
8.
15.
TiS + H2O → H2S + TiO
b. What is my percent yield of titanium(II) oxide if my actual yield is 22 grams and I started with 20 grams of titanium (II) sulfide?
TiS + H2O → H2S + TiO
b. What is my percent yield of titanium(II) oxide if my actual yield is 22 grams and I started with 20 grams of titanium (II) sulfide?
a)
137.5%
b)
113.6%
c)
18.18%
d)
45.45%
9.
Zn + 2HCl → ZnCl2 + H2
15 grams of HCl should theoretically produce 0.42 grams of H2. The reaction actually produced 0.15 grams of H2. What is the percent yield of H2?
15 grams of HCl should theoretically produce 0.42 grams of H2. The reaction actually produced 0.15 grams of H2. What is the percent yield of H2?
a)
2.8%
b)
280%
c)
1%
d)
36%
10.
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
11.
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
12.
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
13.
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
14.
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%
15.
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%
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