Free Printable Stoichiometry exercises

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Stoichiometry exercises

Total questions: 16

Worksheet time: 39mins

Name

Class

Date

If, in the reaction $A+B\ \rightarrow\ C+D$ , the quantity of B is insufficient to react with all of A,

A is the limiting reactant

B is the limiting reactant

Both previous answers are correct

Neither previous answers are correct

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

KNO₃ --> KNO₂ + O₂
What coefficients are needed to balance the reaction?

2, 2, 1

2, 3, 2

1, 2, 2

1, 3, 1

O₂ + CS₂ --> CO₂ + SO₂
What coefficient would go in front of the O₂?

The equation for Percent Yield:

(theoretical/actual) X 100

(actual/theoretical) X 100

(experimental - predicted)/ Predicted X 100

True or False. You must convert grams to moles to establish stoichiometric ratios in a chemical reaction.

True

False

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

What is a Limiting Reagent?

speeds up a reaction

what you run out of first

what you have left over

slows down a reaction

You need 2 pieces of bread, 1 tablespoon of peanut butter and 2 tablespoons of jelly to make a sandwich. If you have 10 pieces of bread, 4 tablespoons of peanut butter and 20 tablespoons of jelly, what is the limiting reactant?

bread

jelly

peanut butter

sandwich

10.

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

11.

Carbon and Oxygen combine to form CO2. Following the reaction: $C+O_2\rightarrow CO_2$ If 10g of Carbon combines with 10g of Oxygen. How many grams of CO2 are produced?

20g of CO₂

28g of CO2

17.5g of CO₂

25g of CO₂

12.

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

13.

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

14.

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

15.

Cl₂ + 2 KBr → Br₂ + 2 KCl

How many grams of potassium chloride (KCl) can be produced from 356 g of chlorine and 356 g of potassium bromide (KBr)?

749 g

223 g

479 g

814 g

16.

In the previous question the limiting reactant is

(a)

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Stoichiometry exercises

Total questions: 16

Worksheet time: 39mins

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