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Unit 6 - Stoichiometry

Total questions: 66

Worksheet time: 6hrs 22mins

Name
Class
Date
1.

Which has more molecules?

a)

1 mole H2O

b)

1 mole CH4

c)

1 mole Cl2

d)

They're are all the same.

2.

5.11 x 1023 atoms of lithium (Li) is equal to how many moles?

a)

1.18 moles

b)

0.351 moles

c)

1.34 moles

d)

0.849 moles

3.

0.75 mole of copper (Cu) is equal to how many atoms?

a)

8.03 x 1023 atoms

b)

6.02 x 1023 atoms

c)

4.51 x 1023 atoms

d)

3.11 x 1023 atoms

4.

What is the mass of one mole of potassium (K)?

a)

19 grams

b)

39.10 grams

c)

30.97 grams

d)

38 grams

5.

Which conversion factor would you use to calculate correctly the mass of 2 moles of the element titanium?

a)

47.86 g Ti / 1 mol Ti

b)

1 mol Ti / 47.84 g Ti

c)

47.84 mol / 1 g Ti

d)

47.87 g Ti / 1 mol Ti

6.

0.50 moles of carbon (C) is equal to how many grams?

a)

6.0 grams

b)

12.0 grams

c)

8.0 grams

d)

14.0 grams

7.

36.0 g of beryllium (Be) contains how many moles?

a)

0.25 mol

b)

4.0 mol

c)

45 mol

d)

320 mol

8.

How many atoms would be contained in 454 grams of iron (Fe)?

a)

6.02 x 1023 atoms

b)

8.14 atoms

c)

4.90 x 1024 atoms

d)

55.85 x 1023 atoms

9.

Find the mass in grams of 2.25 x 1024 atoms of calcium (Ca).

a)

40.0 grams

b)

255.1 grams

c)

150 grams

d)

9.02 x 1024 grams

10.

What is the molar mass of AuCl3?

a)

96.00 g/mol

b)

130.00 g/mol

c)

232.51 g/mol

d)

303.32 g/mol

11.

What is the molar mass of (NH4)3PO4

a)

113.02 g/mol

b)

124.13 g/mol

c)

149.12 g/mol

d)

137.00 g/mol

12.

What is the mass of 2.50 mol of oxygen gas (O2)?

a)

40.0 g

b)

80.0 g

c)

16.0 g

d)

32.0 g

13.

What is the mass of 6.25 mol of Cu(NO3)2?

a)

126 g

b)

785 g

c)

625 g

d)

1172 g

14.
Name the following ionic compound: MgSO4*7H2O
a)
magnesium sulfate * hexahydarte
b)
magnesium sulfate hexahydarte
c)
magnesium sulfate heptahydrate
d)
magnesium sulfate* heptahydrate
15.
Na2CO3 · 10H2O is known as sodium sulfate ______
a)
Hydroxide
b)
Hydrate
c)
Decahydrate
d)
None of the above
16.
Name the following hydrate:  NaCl * 5H2O
a)
sodium chloride 
b)
sodium monochloride pentahydrate
c)
sodium chloride pentahydrate
d)
pentahydrate
17.
A 15.67 g sample of a hydrate of magnesium carbonate was heated to drive off the water. The mass was reduced to 7.58 g. What is the formula of the hydrate?
a)
MgCO3 · 5H2O
b)
MgCO3 · 4H2O
c)
MgCO3 · 6H2O
d)
MgCO3 · 1H2O
18.

A 4.175 gram sample of a certain hydrate of copper (II) sulfate, CuSO4•xH2O, is heated until all the water is driven off. The resulting anhydrous compound weighs 3.120 grams. What is the formula of the hydrate?

a)

CuSO4•H2O

b)

CuSO4•3H2O

c)

CuSO4•6H2O

d)

CuSO4•4H2O

19.

A 5.018 gram sample of a certain hydrate of magnesium sulfate, MgSO4•xH2O, is heated until all the water is driven off. The resulting anhydrous compound weighs 2.449 grams. What is the formula of the hydrate?

a)

MgSO4•9H2O

b)

MgSO4•8H2O

c)

MgSO4•7H2O

d)

MgSO4•6H2O

20.
A hydrate of magnesium chloride is present and the following data is collected:
mass of crucible = 22.130 grams
mass of crucible + hydrate = 25.290 grams
mass of crucible and contents after heating = 23.491 grams
What is the complete formula of this hydrate?
a)
MgCl2 · 7H2O
b)
MgCl2 · 11H2O
c)
MgCl2 · 6H2O
d)
MgCl2 · 13H2O
21.
Cr(NO3)3 ⋅ 9H2O
a)
chromium nitrate nonahydrate
b)
chromium nitrogen trioxide nonahydrate
c)
chromium (III) nitrate nonahydrate
d)
chromium (I) tritrioxide heptahydrate
22.

Using the balanced equation,

Mg(s) + 2 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

23.

Using the balanced equation,

Mg(s) + 2HCl(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

24.

Using the balanced equation,

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

25.
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
26.
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
27.
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
28.
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
29.
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
30.
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
31.
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
32.
 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
33.

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

34.
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
35.
2Al + 3H2SO4 -> Al2(SO4)3 + 3H2
How many grams of Al2(SO4)3 would be formed if 250g H2SO4 completely reacted with aluminum?
a)
0.85 g
b)
290 g
c)
450 g
d)
870 g
36.
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 (KBr)?
a)
749 g
b)
225 g
c)
479 g
d)
814 g
37.
Using the following equation:
4 NH3 + 5 O2 --> 4 NO + 6 H2O
How many grams of oxygen gas are needed to react with 56.8 grams of ammonia (NH3)?
a)
45.08 g O2
b)
133.33 g O2
c)
260.77 g O2
d)
75.92 g O2
38.
4NH3 + 5O2 → 4NO + 6H2O
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
39.
SO2 + PCl5 → SOCl2 + POCl3
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 
40.
Using the balanced equation below,
 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
41.
Given the following reaction  2NaClO3--> 2NaCl + 3O2 . How many grams of NaCl are produced when 80.0 grams of O2 are produced?
a)
500 g Nacl
b)
96.7 g NaCl
c)
6960 g of NaCl
42.
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
43.
6CO2 + 6H2O --> C6H12O6 + 6O2 
What is the total number of moles of water needed to make 2.5 moles of C6H12O6?
a)
2.5
b)
6
c)
12
d)
15
44.
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
45.

For the reaction represented by the equation Cl2 + 2KBr → Br2 + 2KCl, how many grams of potassium chloride (KCl) can be produced from 356 grams potassium bromide (KBr)? Round to one decimal point when calculating.

a)

749 g

b)

223 g

c)

479 g

d)

814 g

46.

Use the following equation:


2Al + 3Cl2 → 2AlCl3


If 140 grams of aluminum chloride react, how many moles of aluminum will be produced?

a)

5.10 moles of Al

b)

1.05 moles of Al

c)

2.25 moles of Al

d)

3.42 moles of Al

47.
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
48.
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
49.
What is the limiting reactant if 10 moles of NH3  react  with 30.0 moles of NO?
4NH3+6NO --> 5N2 + 6H2O
a)
NH3
b)
NO
c)
N2
d)
water
50.
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
51.
P4 + 3O2 --> P4O6 
What is the limiting reactant is 12 moles of P4 react with 15 moles of O2?
a)
P4
b)
O2
c)
P4O6 
d)
none of the above
52.

3NH4NO3 + Na3PO4 --> (NH4)3PO4 + 3 NaNO3


Assuming we start with 30 g of NH4NO3 and 50 g of Na3PO4, identify the limiting reactant.

a)

ammonium phosphate

b)

sodium phosphate

c)

ammonium nitrate

d)

sodium nitrate

53.

3NH4NO3 + Na3PO4 --> (NH4)3PO4 + 3 NaNO3

Assuming we start with 30 g of NH4NO3 and 50 g of Na3PO4, How much of the excess reagent is left over after the reaction is complete?

a)

12 g of sodium phosphate

b)

29.5 g of sodium phosphate

c)

17 g of ammonium nitrate

d)

95 g of ammonium phosphate

54.
4NH3 + 5O2 --> 4NO + 6H2O
How much excess reactant is leftover after if 6.30g of ammonia react with 1.80g of oxygen? 
a)
9.75 g NH3
b)
4.80 g O2
c)
0.765 g NH3
d)
5.54 g NH3
55.
Fe + S --> FeS
If 7.62g Fe react with 8.67g S, what is the limiting reactant?
a)
Fe
b)
S
c)
FeS
d)
none 
56.
CH4 + 2H2O --> CO2 + 4H2
What is the limiting reactant when 20g CH4 react with 15g H2O?
a)
CH4
b)
H2O
c)
CO2
d)
H2
57.

Using the diagram, determine the limiting reactant, the product formed is water.

a)

oxygen

b)

hydrogen

c)

none of the reactant are limiting

d)

both hydrogen and oxygen

58.
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
59.
The ______________ yield is the maximum amount of product possible in a reaction. This determines the amount of product that should be produced in a perfect setting
a)
Percent
b)
actual
c)
stoichiometry
d)
theoretical
60.

When reacting Na with Cl2, we calculated that the theoretical yield should be 13 grams. Our actual yield was 12.5 grams. What is the percent yield?

a)

90.4%

b)

104%

c)

96.15%

d)

1.04%

61.

2Fe2O3 + C → Fe + 3CO2

You add 28 grams of carbon. You find the actual yield to be 181.2 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)

15.5

62.
Theoretical yield = 73g
Actual yield = 62g
Calculate the percent yield.
a)
1.16%
b)
116%
c)
85%
d)
76%
63.
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%
64.

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%

65.
In a lab, a scientist calculate he should produce 12.3 grams of product in his experiment. When he is finished collecting his product it weighs 10.1 grams. What is his percent yield?
a)
82%
b)
0.82%
c)
10.1 %
d)
100%
66.
Lead nitrate can be decomposed by heating.  What is the % yield of the decomposition reaction if 7.4g Pb(NO3)2 are heated to give 4.1 g PbO?
2Pb(NO3)2 (s)→2PbO(s)+4NO2(g)+O2(g)
a)
82%
b)
44%
c)
56%
d)
67%

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