Free Printable Moles and Stoichiometry Review

Worksheets

Moles and Stoichiometry Review

Total questions: 34

Worksheet time: 3hrs 33mins

Name

Class

Date

6CO₂+ 6H₂O --> C₆H₁₂O₆ + 6O₂
What is the total number of moles of water needed to make 2.5 moles of C₆H₁₂O₆?

2.5

What is the molar mass of Fe₃(PO₄)₂

823.8g/mol

357.5 g/mol

455.6g/mol

86.3g/mol

CH₄ + 2O₂ → CO₂ + 2H₂O

24 grams of CH₄ was added to the above reaction. Calculate the theoretical yield of CO₂.

66 grams CO2

132 grams CO2

33 grams CO2

8.72 grams CO2

What is the mole ratio of H₂O to H₃PO₄ in the following chemical equation? P₄O₁₀ + 6 H₂O --> 4 H₃PO₄

6:4

4:6

1:3

3:1

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.

749 g

223 g

479 g

814 g

Use the following equation:

2Al + 3Cl2 → 2AlCl3

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

5.10 moles of Al

1.05 moles of Al

2.25 moles of Al

3.42 moles of Al

Using the following equation:
Fe₂O₃(s) + 3H₂(g) → 2Fe(s) + 3H₂O(l)
How many moles of iron can be made from 6 moles H₂?

4 moles Fe

6 moles Fe

9 moles Fe

2 moles Fe

What is the measured amount of a product obtained from a chemical reaction?

mole ratio

theoretical yield

percentage yield

actual yield

Mole ratios are obtained from the

balanced chemical equation

periodic table

molar mass

10.

How many grams are in 7.8 moles of NaCl?

456 grams

460 grams

450 grams

462 grams

11.

When does a chemical reaction stop?

When the lab is finished

When the excess reactant is used up

When the limiting reactant is used up

Chemical reactions never stop

12.

2Al + 3H₂SO₄ -> Al₂(SO₄)₃ + 3H₂
How many grams of aluminum sulfate would be formed if 250g H₂SO₄ completely reacted with aluminum?

0.85 g

290 g

450 g

870 g

13.

A student burns 1.50 mol C₃H₈ according to the following reaction:

C₃H₈ + 5O₂ → 3CO₂ + 4H₂O

How many grams of carbon dioxide are produced?

44.0 g

66.1 g

132 g

198 g

14.

2H₂ + O₂ → 2H₂O
How many moles of water can be produced if 8 moles H₂ are used?

4 moles

8 moles

16 moles

2 moles

15.

2Na + 2H₂O → 2NaOH+ H₂
How many grams of hydrogen are produced if 120 g of Na are available?

5.2 g

2.6 g

690 g

45 g

16.

2NaClO₃ (s) → 2NaCl (s) + 3O₂ (g)
12.00 moles of NaClO₃ will produce how many grams of O₂?

256 g of O₂

576 g of O₂

288 g O₂

17.

Using the following equation:
Fe₂O₃(s) + 3H₂(g) → 2Fe(s) + 3H₂O(l)
How many moles of iron can be made from 6 moles H₂?

4 moles Fe

6 moles Fe

9 moles Fe

2 moles Fe

18.

9. Complete the equation for the percent yield of a chemical reaction:
Percent yield=(________)÷(________)×100%

actual yield; theoretical yield

theoretical yield; actual yield

19.

If a chemist calculates the maximum amount of product that could be obtained in a chemical reaction, he or she is calculating the

theoretical yield

mole ratio

actual yield

percentage yield

20.

2 KClO₃ → 2 KCl + 3 O₂
How many moles of oxygen are produced when 6.7 moles of KClO₃ decompose completely?

6.7 mol

1.0 mol

10.1 mol

4.5 mol

21.

The limiting reactant

slows the reaction down

is used up first

is the reactant that is left over

controls the speed of the reaction

22.

A chemist interested in the efficiency of a chemical reaction would calculate the

mole ratio

rate of reaction

percent yield

energy released

23.

What is a limiting reactant?

the reactant that determines how much product can be made

the reactant that is in excess

the product that you can make the most of

the amount of reactants that react with each other

24.

Carbon tetrachloride is a solvent which is used as a refrigerant and also as a cleaning agent. Today, methane and chlorine are mainly used to produce carbon tetrachloride:

CH₄ + 4Cl₂ → CCl₄ + 4HCl

How many grams of carbon tetrachloride can be produced from reacting 709.0 grams of chlorine (Cl₂) with excess methane?

3.845 g

61.53 g

384.5 g

6153 g

25.

A student burns 1.50 mol C₃H₈ according to the following reaction:

C₃H₈ + 5O₂ → 3CO₂ + 4H₂O

How many grams of carbon dioxide are produced?

44.0 g

66.1 g

132 g

198 g

26.

For the Balanced Reaction: 3 Mg + 1 Fe₂O₃ → 3 MgO + 2 Fe; What is the Ratio of moles of Fe₂O₃ to moles Fe?

3mol Mg / 2 mol Fe

2 mol Mg/ 3 mol Fe

1 mol Fe₂O₃/ 2 mol Fe

3 mol MgO / 2 mol Fe

27.

N₂ + 3H₂ −-> 2NH₃
How many moles of hydrogen are needed to react with 2 moles of nitrogen?

28.

What is stoichiometry?

Math of Chemistry

way to calculate chemical formulas

Way to balance equations

way to calculate atomic mass

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?

150.22 g Na₂SO₄

593.44 g Na₂SO₄

330.04 g Na₂SO₄

355.13 g Na₂SO₄

30.

For the Balanced Reaction:
3 Mg + 1 Fe₂O₃ → 3 MgO + 2 Fe
What is the Ratio of moles of MgO to moles Fe? (Just be careful re: the chemicals)

3mol Mg / 2 mol Fe

2 mol Mg/ 3 mol Fe

1 mol Fe/ 2 mol Fe

3 mol MgO / 2 mol Fe

31.

CH₄ + 2O₂ → CO₂ + 2H₂O
24 grams of CH₄ was added to the above reaction. Calculate the theoretical yield of CO₂.

66 grams

132 grams

33 grams

8.72

32.

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?

100%

104%

96%

1.04

33.

Theoretical yield = 73g
Actual yield = 62g
Calculate the percent yield.

1.16%

116%

85%

76%

34.

P₄+ 6Cl₂--> 4PCl₃The reaction of 75.0g P₄ with excess chlorine gas produces 110g PCl₃in lab. Find the theoretical yield and calculate percent yield for the reaction.

78%

64%

27%

33%

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Moles and Stoichiometry Review

Total questions: 34

Worksheet time: 3hrs 33mins

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