# Let's Practice Some Fun Stoichiometry Problems!

10 Questions | Total Attempts: 150  Settings  Let's practice some FUN stoichiometry problems! YAY!

Related Topics
• 1.
Ammonia, , and copper (II) oxide react to form solid copper, water and nitrogen gas. What are the coefficients for the balanced chemical equations.
• A.

2,2,2,1,1

• B.

1,2,1,2,1

• C.

2,3,3,3,1

• 2.
If 40g of ammonia reacts with 80.0g copper (II) oxide, determine the limiting reactant. Use nitrogen gas as your unknown.
• A.

Ammonia

• B.

Copper(II) oxide

• 3.
Determine the mass of nitrogen gas produced in the reaction.
• A.

9.4 g

• B.

14.0g

• C.

28.0 g

• 4.
Which reactant is the excess reactant?
• A.

Ammonia

• B.

Copper(II) oxide

• 5.
How much of the excess reactant remains after the reaction? **Ammonia is the excess reactant, meaning it will not be completely used up in a reaction. In other words, you will not be using all 40g of ammonia given. In order to find out how much is left over after the reaction, do a mass-mass problem. 80g CuO is the given and grams of ammonia is the unknown. This answer is how much ammonia is used up. Now, figure out how much is left over!
• A.

19.8 g

• B.

32.4 g

• C.

28.6 g

• 6.
When copper(II) oxide is heated with hydrogen gas, water and copper metal is produced. What mass of copper can be obtained if 32.0g of copper(II) oxide is used?
• A.

24.3g

• B.

25.5g

• C.

27.6g

• 7.
Nitrogen monoxide reacts with oxygen gas to produce nitrogen dioxide. What are the coffecients that balance the equation?
• A.

2,1,2

• B.

1,2,1

• C.

2,1,1

• 8.
What is the theoretical yield of hydrogen gas if 36.0 g of water decomposes to produce hydrogen gas and oxygen gas?
• A.

2.02 g H2

• B.

1.01 g H2

• C.

4.04 g H2

• 9.
What is the percent yield of hydrogen gas if 3.80g of hydrogen is collected in the lab?
• A.

94%

• B.

88%

• C.

96%

• 10.
Which one do you like?
• A.

Option 1

• B.

Option 2

• C.

Option 3

• D.

Option 4