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Stoichiometry Review

Total questions: 68

Worksheet time: 6hrs 48mins

Name
Class
Date
1.
Using the balanced equation in question 1,
Mg(s)   +   HCl(aq)  -->   MgCl₂(aq)   +   H₂(g)
How many grams of HCl are consumed by the reaction of 2.50 moles of magnesium?
a)
5.00 g
b)
7.29
c)
182 g
d)
218 g
2.
Using the balanced equation in question 1,
Mg(s)   +   HCl(aq)  -->   MgCl₂(aq)   +   H₂(g)
What is the mass in grams of H₂ gas when 4.0 moles of HCl is added to the reaction?
a)
0.99 g
b)
4.0 g
c)
2.0 g
d)
6.0 g
3.
What is the first thing you must do to solve a stoichiometry problem?
a)
Write a Balanced Equation
b)
Panic
c)
Write an Unbalanced Equation
d)
Ask for help
4.
For the Balanced Reaction: 3 Mg + 1 Fe2O3 → 3 MgO + 2 Fe; What is the Ratio of moles of Mg to moles Fe?
a)
3mol Mg / 2 mol Fe
b)
2 mol Mg/ 3 mol Fe
c)
1 mol Fe/ 2 mol Fe
d)
3 mol MgO / 2 mol Fe
5.
How many particles are in a mole?
a)
602
b)
602 million
c)
602 moles
d)
6.02 x 1023
6.
What is the mole ratio of H2O to H3PO4 in the following chemical equation?   P4O10 + 6 H2O --> 4 H3PO4 
a)
6:4
b)
4:6
c)
1:3
d)
3:1
7.
2Al + 3H2SO4 -> Al2(SO4)3 + 3H2
How many grams of aluminum sulfate would be formed if 250g H2SO4 completely reacted with aluminum?
a)
0.85 g
b)
290 g
c)
450 g
d)
870 g
8.
For the reaction represented by the equation Cl2 + 2KBr → Br2 + 2KCl, how many grams of potassium chloride can be produced from 356 grams potassium bromide?
a)
749 g
b)
225 g
c)
479 g
d)
814 g
9.
Using the following equation:
Fe2O3(s) + 3H2(g) → 2Fe(s) + 3H2O(l)
How many moles of iron can be made from  6 moles H2? 
a)
4 moles Fe
b)
6 moles Fe
c)
9 moles Fe
d)
2 moles Fe
10.
2Na + 2H2O → 2NaOH+ H2
How many grams of hydrogen are produced if 120 g of Na are available?
a)
5.2 g
b)
2.6 g
c)
690 g
d)
45 g
11.
Using the following equation:
Fe2O3(s) + 3H2(g) → 2Fe(s) + 3H2O(l)
How many moles of iron (Fe) can be made from  6 moles H2? 
a)
4 moles Fe
b)
6 moles Fe
c)
9 moles Fe
d)
2 moles Fe
12.

CH4   +   4 Cl2   →   CCl4  +  4 HCl

If we have 437.496 g of HCl come out of the reaction, how many moles of HCl were there?

a)

1

b)

3

c)

12

d)

6

13.

CH4   +   4 Cl2   →   CCl4  +  4 HCl

If we have 3 moles of CH4 go in to the reaction, how many grams of CH4 was there?

a)

39.057 g

b)

16.043 g

c)

48.129 g

d)

49.052 g

14.
 SiO2 + 3C → SiC + 2CO
I need to add 8 moles of Carbon to the reaction. How many grams of Carbon should I weigh?
a)

96 g

b)
0.67 g
c)
2.67 g
d)
48 g
15.

Given the equation: Zn + 2 HCl → ZnCl₂ + H₂ How many moles of HCl would be required to produce a total of 4.0 grams of H₂?

a)

0.5

b)

2

c)

3

d)

4

16.

Given the reaction: 6 CO₂ + 6 H₂O → C₆H₁₂O₆ + 6 O₂ What is the total number of grams of water needed to make 2.5 moles of C₆H₁₂O₆?

a)

45

b)

108

c)

216

d)

270

17.

Given the reaction: Mg + 2 HCl → MgCl₂ + H₂ What is the total number of grams of Mg consumed when 0.50 mole of H₂ is produced?

a)

6.0 g

b)

12 g

c)

3.0 g

d)

24 g

18.

Given the reaction: 4 Al + 3 O₂ → 2 Al₂O₃ What is the total number of moles of aluminum oxide that can be formed when 2.0 moles of aluminum reacts completely with oxygen?

a)

1.0 mole

b)

2.0 moles

c)

3.0 moles

d)

4.0 moles

19.

Given the balanced equation representing a reaction: CaO(s) + CO₂(g) → CaCO₃(s) + heat What is the total mass of CaO(s) that reacts completely with 88 grams of CO₂(g) to produce 200 grams of CaCO₃(s)?

a)

56 g

b)

88 g

c)

112 g

d)

288 g

20.

Given the reaction: 2 H₂ + O₂ → 2 H₂O The total number of grams of O₂ needed to produce 3 moles of water is

a)

36

b)

48

c)

61

d)

75

21.

Given the balanced equation representing a reaction: 2H₂ + O₂ → 2H₂O What is the total mass of water formed when 8 grams of hydrogen reacts completely with 64 grams of oxygen?

a)

18 g

b)

36 g

c)

56 g

d)

72 g

22.

Given the reaction: 2 C₈H₁₈(g) + 25 O₂(g) → 16 CO₂(g) + 18 H₂O(g) What mass of C₈H₁₈(g) will completely react to produce exactly 1.6 moles of H₂O(g)?

a)

137 grams

b)

10.2 grams

c)

183 grams

d)

20.3 grams

23.
2NaClO3 (s) → 2NaCl (s) + 3O2 (g)  
12.00 moles of NaClO3 will produce how many grams of O2?
a)
256 g of O2
b)
576 g of O2
c)
288 g O2
24.
Cl2 + 2KBr → Br2 + 2KCl
How many grams of potassium chloride (KCl) can be produced from 356 g of potassium bromide (KBr)?
a)
749 g
b)
223 g
c)
479 g
d)
814 g
25.
Fe2O3 + 3H2 → 2Fe + 3H2O
About how many grams of H2O will be produced from 150 grams of Fe2O3? 
a)
50 grams H2O
b)
60 grams H2O
c)
5000 grams H2O
d)
6000 grams H2O
26.
Given the following reaction, 2 NaClO3 (s) --> 2NaCl (s) +3 O2 (g)  12.00 moles of NaClO3 will produce how many grams of O2?
a)
256 g of O2
b)
576 g of O2
c)
288 g O2
27.
N2 +  3H2 −->  2NH3 
How many moles of hydrogen are needed to react with 2 moles of nitrogen?
a)
6
b)
2
c)
3
d)
1
28.
N2 +  3H2 −->  2NH3 
How many moles of hydrogen are needed to react with 2 moles of nitrogen?
a)
6
b)
2
c)
3
d)
1
29.
Use the following equation:
2NaOH(aq) + H2SO4(aq) --> 2H2O(l) + Na2SO4(aq)
How many grams of sodium sulfate will be formed if you start with 200 grams of sodium hydroxide?
a)
150.22 g Na2SO4
b)
593.44 g Na2SO4
c)
330.04 g Na2SO4
d)
297.65 g Na2SO4
30.
2 KClO3 → 2 KCl + 3 O2
How many moles of oxygen are produced when 6.7 moles of KClO3 decompose completely?
a)
6.7 mol
b)
1.0 mol
c)
10.1 mol
d)
4.5 mol
31.

151 grams of Al2O3 are produced. How many grams of Al was needed in the reaction? Al + O2 -------> Al2O3 balance first.

a)

79.91 g

b)

22.4 liters

c)

57.8 g

d)

142.8 g

32.

What is the mole-to-mole ratio for hydrogen and oxygen in the balanced equation: 2 H2 + O2 -> 2 H2O?

a)

1:2

b)

1:1

c)

3:1

d)

2:1

33.

How many moles of H2O are produced when 4 moles of O2 react? 2 H2 + O2 -> 2 H2O

a)

8 mol

b)

2 mol

c)

6 mol

d)

10 mol

34.

What is the mass of NaCl produced when 2.2 moles of Na react with excess Cl2?

2 Na + Cl2 →\rightarrow 2 NaCl

molar mass of NaCl = 58.44 g/mol

a)

128.57 g

b)

58.65 g

c)

117.3 g

d)

234.6 g

35.

How many moles of CO2 are produced when 5.6 grams of C6H12O6 react?

C6H12O6 + 6 O2 →\rightarrow 6 CO2 + 6 H2O

Molar mass C6H12O6 = 180.18 g/mol

a)

2.5 mol

b)

1.5 mol

c)

0.186 mol

d)

0.5 mol

36.
Using the following equation:
Fe2O3(s) + 3H2(g) → 2Fe(s) + 3H2O(l)
How many moles of iron can be made from  6 moles H2? 
a)
4 moles Fe
b)
6 moles Fe
c)
9 moles Fe
d)
2 moles Fe
37.
N2 +  3H2 → 2NH3 
How many moles of hydrogen are needed to react with 2 moles of nitrogen?
a)

6 mol H

b)

2 mol H

c)

3 mol H

d)

1 mol H

38.
2 NaClO3 (s) --> 2NaCl (s) +3 O2 (g)  
12.00 moles of NaClO3 will produce how many grams of O2?
a)
256 g of O2
b)
576 g of O2
c)
288 g O2
39.

4 Al + 3 O2 –> 2 Al2O3  How many moles of aluminum would be needed to completely react with 45 grams of O2?

a)

1.05 moles

b)

3.75 moles

c)

2.475 moles

d)

1.875 moles

40.
Mg(s) + 2 HCl(aq)  -->  MgCl₂(aq)   + H₂(g)
How many moles of HCl are consumed in the production of 7.5 moles of MgCl₂?
a)
3.8 moles
b)
15 moles
c)
7.5 moles
d)
23 moles
41.
 CaC₂(s) + 2H₂O(l)   -->   C₂H₂(g)   + Ca(OH)₂(aq)
how many grams of Ca(OH)₂ would be formed with 3.20 moles of CaC₂?
a)
119 g
b)
21.2 g
c)
114 g
d)
237 g
42.
Use the following equation:
NaIO3(aq) + 6HI(aq) --> 3I2(s) + NaI(aq) + 3H2O(l)
How many moles of iodine can be made from 6.55 moles of NaIO3?
a)
4.55 moles I2
b)
23.18 moles I2
c)
19.65 moles I2
d)
34.99 moles I2
43.

Using the following equation: 4NH3(g) + 5O2(g) --> 4NO(g) + 6H2O(l) How many grams of oxygen gas are needed to react with 3.34 moles of NH3?

a)

45.08 g O2

b)

133.6 g O2

c)

260.77 g O2

d)

75.92 g O2

44.

How many moles of Zn will be formed if 32.0 g of Cu is used as a reactant?

2 Cu+ Zn(NO3)2--> Zn + 2 Cu(NO3)

a)

0.25 moles Zn

b)

0.251 moles Zn

c)

0.252 moles Zn

45.
CH4  +  2O2  →  CO2  +  2H2O
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
46.

2Fe2O3 + 3C → 4Fe + 3CO2

You add 28 grams of carbon. You find the actual yield to be 81.2 grams of CO2. What is the percent yield of CO2? (Hint: calculate theoretical yield of CO2 first)

a)

58.83%

b)

308%

c)

6435%

d)

79.14%

47.
Theoretical yield = 73g
Actual yield = 62g
Calculate the percent yield.
a)
1.16%
b)
116%
c)
85%
d)
76%
48.
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. 
a)
78%
b)
64%
c)
27%
d)
33%
49.
CH4 + 2O2 --> 2H2O + CO2
What is the mass of CO2 produced when 35g of O2 reacts? 
a)
1.09 g
b)
24.1 g
c)
28.2 g
d)
44.0 g
50.
True or False. You must convert grams to moles to do stoichiometry.
a)
True
b)
False
51.

Given the following equation:

2Al + 6HCl → 2AlCl3 + 3H2

If 3.00 grams of H2 were produced, how many grams of Al reacted?

a)

108.0 g

b)

60.8 g

c)

27.0 g

d)

0.33 g

52.

From the reaction: B2H6 + 3O2 -->2 HBO2 + 2 H2O

What mass of O2 will be needed to burn 36.1 g of B2H6?

B2H6 = 27.68 g/mol

a)

13.8 g O2

b)

3.91 mol of O2

c)

125 g O2

d)

41.7 g O2

53.
Using the following equation:
Fe2O3(s) + 3H2(g) → 2Fe(s) + 3H2O(l)
How many moles of iron can be made from  6 moles H2? 
a)
4 moles Fe
b)
6 moles Fe
c)
9 moles Fe
d)
2 moles Fe
54.
N2 +  3H2 → 2NH3 
How many moles of hydrogen are needed to react with 2 moles of nitrogen?
a)

6 mol H

b)

2 mol H

c)

3 mol H

d)

1 mol H

55.
2H2   +   O2  →  2H2O
How many moles of water can be produced if 8 moles H2 are used?
a)
4 moles
b)
8 moles
c)
16 moles
d)
2 moles
56.
2 NaClO3 (s) --> 2NaCl (s) +3 O2 (g)  
12.00 moles of NaClO3 will produce how many grams of O2?
a)
256 g of O2
b)
576 g of O2
c)
288 g O2
57.
B2H6 + 3O2 -->2 HBO2 + 2 H2O
 What mass of O2 will be needed to burn 36.1 g of B2H6?
a)
13.8 g O2
b)
3.86 mol of O2
c)
124 g O2
58.
4 Al + 3 O2 –> 2 Al2O3  How much aluminum would be needed to completely react with 45 grams of O2?
a)
1.05 moles
b)
3.75 moles
c)
1.875 grams
d)
1.875 moles
59.
2Al + 3H2SO4 -> Al2(SO4)3 + 3H2
How many grams of aluminum sulfate would be formed if 250g H2SO4 completely reacted with aluminum?
a)
0.85 g
b)
290 g
c)
450 g
d)
870 g
60.
Mg(s) + 2 HCl(aq)  -->  MgCl₂(aq)   + H₂(g)
How many moles of HCl are consumed in the production of 7.5 moles of MgCl₂?
a)
3.8 moles
b)
15 moles
c)
7.5 moles
d)
23 moles
61.
 CaC₂(s) + 2H₂O(l)   -->   C₂H₂(g)   + Ca(OH)₂(aq)
how many grams of Ca(OH)₂ would be formed with 3.20 moles of CaC₂?
a)
119 g
b)
21.2 g
c)
114 g
d)
237 g
62.
Use the following equation:
NaIO3(aq) + 6HI(aq) --> 3I2(s) + NaI(aq) + 3H2O(l)
How many moles of iodine can be made from 6.55 moles of NaIO3?
a)
4.55 moles I2
b)
23.18 moles I2
c)
19.65 moles I2
d)
34.99 moles I2
63.
Using the following equation:
4NH3(g) + 5O2(g) --> 4NO(g) + 6H2O(l)
How many grams of oxygen gas are needed to react with 56.8 grams of ammonia?
a)
45.08 g O2
b)
133.33 g O2
c)
260.77 g O2
d)
75.92 g O2
64.
2 KClO3 → 2 KCl + 3 O2
How many moles of oxygen are produced when 6.7 moles of KClO3 decompose completely?
a)
6.7 mol
b)
1.0 mol
c)
10.1 mol
d)
4.5 mol
65.
2Na + 2H2O → 2NaOH+ H2
How many grams of hydrogen are produced if 120 g of Na are available?
a)
5.2 g
b)
2.6 g
c)
690 g
d)
45 g
66.
Cl2 + 2 KBr → Br2 + 2 KCl
How many grams of potassium chloride can be produced from 356 g of chlorine and 356 g of potassium bromide?
a)
749 g
b)
223 g
c)
479 g
d)
814 g
67.
CH4 + 2 O2 → CO2 + 2 H2O
How many moles of carbon dioxide are produced from the combustion of 110 g of CH4?
a)
13.7 mol
b)
2.75 mol
c)
6.11 mol
d)
6.85 mol
68.
Fe (s) + S (l) --> FeS (s)  

In the experiment above, 7.62 g of Fe are allowed to react with 8.67 g of S.
How much FeS is formed?
a)
14.8 g
b)
12.2 g
c)
13.7 g
d)
19.9 g

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