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Limiting Reactants and Percent Yield Practice

Total questions: 55

Worksheet time: 3hrs 11mins

Name
Class
Date
1.

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 and state the theoretical yield of product.

a)

Cl2

b)

Al

c)

2.0 mol AlCl3

d)

1.3 mol AlCl3

2.

Theoretical yield = 73.0g

Actual yield = 62.0g

Calculate the percent yield.

a)

1.16%

b)

116%

c)

84.9%

d)

76.0%

3.

4NH3 + 5O2 ⟶ 4NO + 6H2O

How many grams of NO are formed if 6.30g of ammonia react with 1.80g of oxygen?

a)

0.370g

b)

0.0450g

c)

1.35g

d)

11.1g

4.

3NH4NO3 + Na3PO4 ⟶ (NH4)3PO4 + 3 NaNO3


If 30 g of NH4NO3 and 50 g of Na3PO4 react, identify the limiting reactant.

a)

ammonium phosphate

b)

sodium phosphate

c)

ammonium nitrate

d)

sodium nitrate

5.

CuCl2 + 2NaNO3 ⟶ Cu(NO3)2 + 2NaCl


If 15.0 grams of CuCl2 react with 20.0 g of NaNO3, what mass of NaCl will be produced?

a)

13.0 g of NaCl

b)

98 g of NaCl

c)

26 g of NaCl

d)

17.4 of NaCl

6.

SO2 + PCl5 ⟶ SOCl2 + POCl3

What mass of SOCl2 is produced when 16.2g SO2 react with 13.7g PCl5?

a)

7.87g

b)

30.1g

c)

26.4g

d)

19.8g

7.

C3H8 + 5O2 ⟶ 3CO2 + 4H2O

What mass of carbon dioxide will be produced when 3.0g of propane is burned in 2.1g of oxygen?

a)

0.55g

b)

0.038g

c)

2.9g

d)

0.90g

8.

Al(OH)3 + 3HCl ⟶ 3H2O + AlCl3

14 grams of Al(OH)3 is completely reacted with excess hydrochloric acid. If you actually recovered 22.0 grams of aluminum chloride, what is the percent yield of the reaction?

a)

100%

b)

25%

c)

92%

d)

69%

9.

What is the limiting reactant if 10.0 moles of NH3 react with 30.0 moles of NO?

4NH3 + 6NO ⟶ 5N2 + 6H2O

a)

NH3

b)

NO

c)

N2

d)

water

10.

When 13.0 moles of O2 reacts with 1.50 mole of C10H8,

how many moles of CO2 will be produced?

 C10H8 + 12 O2 ⟶ 10 CO2 + 4 H2O

a)

10.8 moles CO2

b)

15.0 moles CO2

c)

13.0 moles CO2

d)

14.5 moles CO2

e)

1.50 moles CO2

11.

P4 + 3O2 ⟶ P4O6 

How many moles of P4O6 will be produced if 12 moles of P4 react with 15 moles of O2?

a)

15 moles P4O6 

b)

12 moles P4O6 

c)

5.0 moles P4O6 

d)

27 moles P4O6 

12.

4NH3 + 5O2 ⟶ 4NO + 6H2O

How many grams of NO are formed if 6.30 g of ammonia react with 1.80 g of oxygen?

a)

0.37g

b)

0.045g

c)

1.35g

d)

11.1g

13.

P4 + 6Cl2 ⟶ 4PCl3 

The reaction of 75 g P4 with excess chlorine gas produces 110g PCl3 in lab. Calculate the percent yield for the reaction. 

a)
78%
b)
64%
c)
27%
d)
33%
14.

3NH4NO3 + Na3PO4 ⟶ (NH4)3PO4 + 3 NaNO3

What is the maximum amount of each product that can be formed?

a)

18.6 g of ammonium phosphate, 31.9 of sodium nitrate

b)

54 g of ammonium phosphate, 31.9 of sodium nitrate

c)

32.4 g of ammonium nitrate, 76 g of sodium phosphate

d)

21 g of ammonium nitrate, 34 g of sodium phosphate

15.

CuCl2 + 2NaNO3 ⟶ Cu(NO3)2 + 2NaCl

If 15.0 grams of CuCl2 react with 20.0 g of NaNO3, what mass of NaCl will be produced?

a)

13.0 g of NaCl

b)

98.0 g of NaCl

c)

26.0 g of NaCl

d)

17.4 of NaCl

16.

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 
17.

SO2 + PCl5 ⟶ SOCl2 + POCl3

What mass of SOCl2 is produced when 16.2g SO2 react with 13.7g PCl5? 

a)
7.87g
b)
30.1g
c)
26.4g
d)
19.8g 
18.

What mass of nitrogen gas will be produced if 9.00 moles of NH3  react  with 27.0 moles of NO?

4NH3 + 6NO ⟶ 5N2 + 6H2O

a)

36.0 g N2

b)

630. g N2

c)

315 g N2

d)

321 g N2

19.

4NH3 + 5O2 ⟶ 4NO + 6H2O

How many grams of H2O are formed if 13.0 g of ammonia react with 15.0 g of oxygen? 

a)

20.6 g H2O

b)

20.25 g H2O

c)

10.1 g H2O

d)

9.18 g H2O

20.

Fe + S ⟶ FeS

If 9.95g Fe react with 12.0 g S, what is the limiting reactant? What mass of excess reactant will remain?

a)

Fe is the limiting reactant, S is in excess

b)

S is the limiting reactant, Fe is in excess

c)

6.28 g excess reactant remains

d)

0.196 g excess reactant remains

e)

9.77 g excess reactant remains

21.

2 NaCl + Pb(NO3)2 ⟶ 2 NaNO3 + PbCl2  

How many grams of lead (II) chloride are produced from the reaction of 15.3 g of NaCl and 60.8 g of Pb(NO3)2? 

a)
21.5g
b)
51.1g
c)
43.4g
d)
36.4g
22.

In a lab, a scientist calculated that they should produce 12.3 grams of product in their experiment. When they are finished collecting the product, it has a mass of 10.1 grams. What is the percent yield?

a)

82.1%

b)

22.8%

c)

18.7%

d)

12.2%

23.

Calculate the theoretical yield if given the actual yield and percent yield are 51.4g and 77.0% respectively.

a)

25.6g

b)

1.5g

c)

15g

d)

66.8g

24.

In the image, which reactant is limiting?

a)

The white molecules, because there are extra.

b)

The black atoms, because they are completely used up.

c)

The white molecules, because they are completely used up.

d)

The black atoms, because there are extra.

25.
Theoretical yield = 73g
Actual yield = 62g
Calculate the percent yield.
a)
1.16%
b)
116%
c)
85%
d)
76%
26.

P4 + 3O2 ⟶ P4O6

How many moles of excess reactant will remain when 5.0 moles of P4 react with 5.0 moles of oxygen gas?

a)

3.34 mol P4 in excess

b)

1.66 mol P4 in excess

c)

3.34 mol O2 in excess

d)

1.66 mol O2 in excess

27.

SO2 + PCl5 ⟶ SOCl2 + POCl3

What mass of POCl3 is produced when 13 g SO2 are combined with 25g PCl5?

a)

18g

b)

62g

c)

38g

d)

2.7g

28.

3CaCO3 + 2FePO4 ⟶C a3(PO4)2 + Fe2(CO3)3


What is the maximum amount of each product that can be formed? (assuming 100. g CaCO3 and 45 g FePO4 from the previous problem are used)((CaCO3 = 100.09 g/mol; FePO4 = 150.82 g/mol; Ca3(PO4)2 = 310.18 g/mol; Fe2(CO3)3 = 291.73 g/mol)

a)

85 g of calcium carbonate, 39 g of iron(III) phosphate

b)

12.4 g of calcium phosphate, 27 g of iron(III) carbonate

c)

37.2 g of calcium phosphate, 29.3 g of iron(III) carbonate

d)

46.3 g of calcium phosphate, 43.8 g of iron(III) carbonate

29.

4NH3 + 5O2 --> 4NO + 6H2O

How many grams of NO are formed if 6.30 g of ammonia react with 1.80 g of Oxygen

a)

2.36 g

b)

1.35 g

c)

8.9 g

d)

1.45 g

30.

C3H8 + 5O2 -> 3CO2 + 4H2O

How much carbon dioxide is produced when 3.0 g of propane is burned in 2.1 g of Oxygen ?

a)

0.11 g

b)

0.55 g

c)

2.8 g

d)

1.5 g

31.

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%

32.

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

33.

LiOH + KCl → LiCl + KOH

After reacting 20.0 grams of lithium hydroxide according to the reaction above, 6.00 grams of lithium chloride were produced. What is the percent yield?

a)

16.9%

b)

5.91%

c)

1.88%

d)

12.3%

34.

The reaction of 25.0 g benzene, C6H6, with excess HNO3 resulted in 21.4 g C6H5NO2. What is the percentage yield?

C6H6 + HNO3 → C6H5NO2 + H2O

a)

100%

b)

27.39%

c)

54.29%

d)

85.62%

35.
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%
36.

Na2CO3 + 2HCl ⟶ 2NaCl + CO2 + H2O

87g of sodium carbonate (Na2CO3) reacts with 120g of hydrochloric acid (HCl) to produce sodium chloride, carbon dioxide and water. What is the limiting reactant?

a)

Sodium carbonate

b)

Hydrochloric acid

c)

Water

d)

Sodium chloride

37.

SiCl4 + 4H2O <=> H4SiO4 + 4HCl

40g of silicon tetrachloride (SiCl4) reacts with 22g of water to produce silicic acid and hydrochloric acid (HCl). What reactant is in excess?

a)

Water

b)

Hydrochloric Acid

c)

Silicic Acid

d)

Silicon Tetrachloride

38.

2C7H6O2 + 15O2 <=> 14CO2 + 6H2O


23.0g of oxygen gas reacts with 42.0g of benzoic acid (C7H6O2) to produce carbon dioxide and water. What is the limiting reactant?

a)

Carbon dioxide

b)

Oxygen gas

c)

Benzoic acid

d)

Water

39.

A chemical reaction was carried out where a yield of 73g was expected, but a yield of 62g was obtained. Calculate the percent yield.

a)

85%

b)

118%

c)

84.9%

d)

11%

40.

2Fe2O3 + C → Fe + 3CO2

You add 28.0 grams of carbon. You find the actual yield to be 181.2 grams of CO2. What is the percent yield of CO2?

a)

209%

b)

15.8%

c)

6435%

d)

16%

41.

P4 + 6Cl2 ⟶ 4PCl3

The reaction of 75.0g P4 with excess chlorine gas produces 110g PCl3 in lab. Calculate percent yield for the reaction.

a)

78%

b)

64%

c)

33%

d)

27%

42.

Identify the limiting reagent when 6.00 moles HCl combines with 5.00 moles Mg to form MgCl2.   1 Mg +  2 HCl ⟶ 1 MgCl2  +  1 H2     

a)
Mg
b)
H2
c)
MgCl2
d)
HCl
43.

When 12 moles of O2 reacts with 6 moles of C10H8, what is the limiting reactant?   1 C10H8 + 12 O2 ⟶ 10 CO2 + 4 H2O

a)
Oxygen
b)
C10H8
c)
Water
d)
Carbon Dioxide
44.

1 P4 + 3 O2 ⟶ 1 P4O6  What is the limiting reactant if 12 moles of P4 react with 15 moles of O2?

a)
P4
b)
O2
c)
P4O6 
45.

6Na + Fe2O3 ⟶ 3Na2O + 2Fe

If you are provided 200. g of sodium and 250. grams of iron(III) oxide, how much of excess reagent will remain when the reaction has gone to completion?

a)

232 g

b)

18 g

c)

250 g

46.

How many grams of ammonia (NH3) can be produced from the reaction of 13.4 g of nitrogen gas and 32.2 grams of hydrogen gas? 

a)

5.1 g

b)

45.6 g

c)

16.3 grams

d)

11.4 grams

47.

200. grams of silver nitrate are combined with 200. grams of sodium phosphate . How much silver phosphate will be produced? 

3AgNO3  + Na3(PO4)  ⟶  Ag3(PO4)  + 3NaNO3

a)
164 g
b)
64 g
c)
146 g
d)
164 moles
48.

C3H8 + 5O2 ⟶ 3CO2 + 4H2O

What mass of carbon dioxide is produced when 3.0g of propane is burned in 2.1g of oxygen?

a)

1.7g

b)

0.038g

c)

2.9g

d)

9.0g

49.

3CaCO3 + 2FePO4 ⟶ Ca3(PO4)2 + Fe2(CO3)3

If 100.g of CaCO3 reacts with 45.0g of FePO4, how much of the excess reagent is left over after the reaction is complete?

a)

57.3 g of sodium phosphate

b)

55.2g of calcium carbonate

c)

25.0 g of calcium carbonate

d)

16.9 g of sodium phosphate

50.

C3H8 + 5 O2 →3 CO2 + 4 H2O

The percent yield was 75%. If the reaction started with 5.0 grams of C3H8, how many grams of water were produced?

a)

6.2 grams

b)

1.5 grams

c)

8.3 grams

d)

4.2 grams

51.

Be + 2 HCl → BeCl2 + H2    

If the theoretical yield of beryllium chloride was 10.7 grams and the actual yield was 4.5 grams, what was the percent yield? 

a)
42.1 %
b)
2.38 %
c)
1.24 %
d)
27.2 %
52.

What mass of ammonia, NH3, can be produced from the reaction of 28.0 g of nitrogen gas and 25.0 g of hydrogen gas, H2(g)?

N2 + 3 H2 ⟶ 2 NH3

a)

141 g

b)

8.26 g

c)

17.0 g

d)

34.1 g

53.

4NH3 + 5O2 ⟶ 4NO + 6H2O

How many grams of NO will formed if 6.30g of ammonia react with 1.80g of oxygen?

a)

11.1 g

b)

9.74 g

c)

1.35 g

d)

8.10 g

54.

Consider the reaction shown in the particle level diagrams to the left. Which species is the limiting reactant?

a)
b)
c)
d)

There was no limiting reactant

55.

Consider the particle level model of a chemical reaction shown to the left. Which of the following correctly describes the reaction?

a)

The blue molecules are the limiting reactant.

b)

The red molecules are the limiting reactant.

c)

The blue molecules are in excess by 2 molecules.

d)

There is no limiting reactant.

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