Free Printable Stoichiometry Review

Worksheets

Stoichiometry Review

Total questions: 25

Worksheet time: 2hrs 34mins

Name

Class

Date

Mole ratios are obtained from the

balanced chemical equation

periodic table

molar mass

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

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

How many grams are in 7.8 moles of NaCl?

476grams

460 grams

452 grams

462 grams

Balance the following reaction :

CaC₂(s) + H₂O(l) --> C₂H₂(g) + Ca(OH)₂(aq)

1,2,2,2

1,2,1,1

2,1,1,1

2,1,2,1

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

1.05 moles

3.75 moles

1.875 grams

1.875 moles

What is the first thing you must do to solve a stoichiometry problem?

Make sure the chemical reaction is Balanced

Panic

Make sure the Equation is Unbalanced

Multiple by Avogadro's Number

How many moles of H₂ are needed to react with 2 moles of N₂according to the reaction?

1 N₂ + 3 H₂ → 2 NH₃

1 Cl₂ + 2 KBr → 1 Br₂ + 2 KCl

How many GRAMS of KCl can be produced from 356 g of KBr?

749 g

223 g

479 g

814 g

10.

2Na + 2H₂O → 2NaOH+ H₂

How many grams of H₂ are produced if 120 g of Na are available?

5.2 g

2.6 g

690 g

45 g

11.

What is a Limiting Reactant?

the amount you end with

the chemical you run out of first

the unreacted chemical you have left over

the amount you start with

12.

What is an Excess Reactant?

the amount you end with

the chemical you run out of first

the unreacted chemical you have left over

the amount you start with

13.

How many grams of nitric acid can be prepared from the reaction of 138 g of NO₂ with 54.0 g H₂O according to the equation below?

3NO₂ + H₂O --> 2HNO₃ + NO

108

126

189

279

14.

How many grams of NH3 can be produced from the mixture of 3.0 g each of nitrogen and hydrogen by the Haber process?

N₂ + 3H₂ --> 2NH₃

2.0 g

3.0 g

3.6 g

6.0 g

15.

Stoichiometry is based on the law of conservation of

charge

mass

reactants

volume

16.

What is the molar mass of NaOH?

40.0 g/mol

38.9 g/mol

23.9 g/mol

57.0 g/mol

17.

How many particles are in a mole?

602

602 million

602 moles

6.02 x 10²³

18.

What are the units for molar mass?

grams

amu

grams/mole

liters

19.

What is the molar mass of B₂(CO₃)₃?

81.632 g/mol

94.842 g/mol

38.822 g/mol

201.648 g/mol

20.

2Al + 3H₂SO₄ -> Al₂(SO₄)₃ + 3H₂

How many grams of aluminum sulfate would be formed if 250g H₂SO₄ completely reacted?

0.85 g

290 g

450 g

870 g

21.

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

22.

SiO₂ + 3C → SiC + 2CO

Using the balanced equation how many moles of Carbon monoxide would be produced from 6 moles of carbon?

112.0 mol CO

4.0 mol CO

28.0 mol CO

48.0 mol CO

23.

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.

AlCl3

Cl2

24.

When 12 moles of O₂ reacts with 1.1 mole of C₁₀H₈what is the limiting reactant? C₁₀H₈ + 12 O₂ --> 10 CO₂ + 4 H₂O

Oxygen

C₁₀H₈

Water

Carbon Dioxide

25.

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

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

ammonium phosphate

sodium phosphate

ammonium nitrate

sodium nitrate

100 %

Stoichiometry Review

Total questions: 25

Worksheet time: 2hrs 34mins

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