Question 1

In a laboratory experiment, a student calculates that they should produce

12.5

grams of copper(II) sulfate based on their balanced chemical equation. After finishing the experiment, they weigh their dry product and find they have collected

10.0

grams. What is the percent yield of this reaction?

Accepted Answer

80.0%

Answer

25.0%

Answer

125%

Answer

85.0%

Question 2

If a chemical reaction has a theoretical yield of

12.5

grams but results in a

10.0

percent yield, what is the actual yield of the product obtained?

Accepted Answer

31.5 g

Answer

64.3 g

Answer

13.5 g

Answer

35.0 g

Question 3

Which of the following best describes the "theoretical yield" in a chemical reaction?

Accepted Answer

The maximum amount of product that can be produced from a given amount of reactant according to stoichiometric calculations.

Answer

The mass of the excess reactant that remains after the reaction has gone to completion.

Answer

The ratio of the amount of product obtained to the amount of product expected, multiplied by 100.

Answer

The amount of product actually measured and collected at the end of an experiment in the laboratory.

Question 4

If a reaction produces

12.5

grams of product in the lab, but the stoichiometric calculations predicted a yield of

10.0

grams, what represents the

20.0

gram value?

Accepted Answer

Theoretical yield

Answer

Percent yield

Answer

Limiting reactant

Answer

Actual yield

Question 5

Which of the following scenarios would most likely result in a percent yield that is greater than

12.5

in a high school chemistry experiment?

Accepted Answer

The product was still wet when its mass was measured on the balance.

Answer

A side reaction occurred, forming an additional gaseous byproduct that escaped.

Answer

The reaction did not reach completion due to a lack of heat.

Answer

Some of the product was spilled while transferring it to the weighing paper.

Question 6

In the industrial synthesis of ammonia, the theoretical yield of a specific run is calculated to be

12.5

kg. If the process produces an actual yield of

10.0

kg, what is the percent yield?

Accepted Answer

82.0%

Answer

90.0%

Answer

122%

Answer

0.82%

Question 7

A chemist attempts to synthesize aspirin in a lab and determines that the theoretical yield is

12.5

grams. If the actual yield obtained is

10.0

grams, what calculation should be performed to determine the percent yield?

Accepted Answer

(9.30 / 12.4) * 100

Answer

(9.30 / 12.4) * 100

Answer

(9.30 / 12.4) * 100

Answer

(9.30 / 12.4) * 100

Question 8

If a student calculates that the maximum possible amount of silver chloride they can produce is

12.5

grams, but they accidentally leave some of the product on the filter paper during transfer and only recover

10.0

grams, what is their percent yield?

Accepted Answer

74.9%

Answer

25.1%

Answer

33.5%

Answer

133.5%

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