Free Printable Stoichiometry

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Stoichiometry

Total questions: 21

Worksheet time: 56mins

Name

Class

Date

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

Write a Balanced Equation

Panic

Write an Unbalanced Equation

Ask for help

What is a Limiting Reagent?

speeds up a reaction

what you run out of first

what you have left over

slows down a reaction

What is a Excess Reagent?

amount you end with

what you run out of first

what you have left over

what you start with

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

3mol Mg / 2 mol Fe

2 mol Mg/ 3 mol Fe

1 mol Fe/ 2 mol Fe

3 mol MgO / 2 mol Fe

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

Gary Busey

If you predicted that 1.5 moles of Magnessium are used in a reaction, and you have 2.0 moles of Magnessium, what type of reactant is Magnessium?

Limiting Reactant

Excess Reactant

Fast Reacter

Non-Reactant

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

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

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

10.

2 CO (g) + O₂(g) → 2 CO₂ (g)
In the formation of CO₂ from CO and oxygen, how many Liters of CO₂ are produced by the reaction of 8 mols of O₂ with an excess of carbon monoxide?

0.178 L

358.4 Liters

704 grams

0.36 grams

11.

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?

749 g

223 g

479 g

814 g

12.

CH₄ + 2 O₂ → CO₂ + 2 H₂O
How many moles of carbon dioxide are produced from the combustion of 110 g of CH₄?

13.7 mol

2.75 mol

6.11 mol

6.85 mol

13.

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?

14.8 g

12.2 g

13.7 g

19.9 g

14.

Identify the limiting reagent when 6.00 g HCl combines with 5.00 g Mg to form MgCl₂.

Mg + 2HCl --> MgCl₂ + H₂

MgCl2

HCl

15.

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

16.

Mole ratios are obtained from the

balanced chemical equation

periodic table

molar mass

17.

How many moles of water could form from 5.00 moles of hydrogen?

5.00 moles

10.00 moles

2.50 moles

No Reaction

18.

How many grams of potassium nitrate would you need to react with 0.901 moles of sulfuric acid?

182 grams of potassium nitrate

901 grams of potassium nitrate

91 grams of potassium nitrate

364 grams of potassium nitrate

19.

How many liters of carbon dioxide at STP are formed from 8.00 liters of oxygen at STP reacting with methane (CH4)?

4.00 liters of carbon dioxide

22.4 liters of carbon dioxide

0.357 liters of carbon dioxide

0.179 liters of carbon dioxide

20.

How many molecules of benzene (C₆H₆) are combusted if there are 134.4 liters of carbon dioxide produced at STP?

6.02 x 10²³ molecules of benzene

1 mole of benzene

78.1 grams of benzene

22.4 liters of benzene

21.

You react 5.00 moles of iron with excess oxygen and collect 385 grams of iron (III) oxide. What is your % yield?

96.5% yield of iron (III) oxide

399 gram of iron (III) oxide

104% yield of iron (III) oxide

82.4% yield of iron (III) oxide

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Stoichiometry

Total questions: 21

Worksheet time: 56mins

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