Practice Actual Yield in Chemistry

Use these practice problems to test your method after reviewing the concept explanation and worked examples.

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Quick Recap

The amount of product actually obtained from a reaction in the lab or in an industrial process.

What you really got after doing the reaction.

Showing a random 20 of 50 problems.

Example 1

easy

Theoretical yield is

80\text{ g}

and actual yield is

60\text{ g}

. How much product was lost?

Example 2

easy

A reaction's theoretical yield is

50\text{ g}

, but a chemist measures

42\text{ g}

of product. What is the actual yield?

Example 3

easy

Can the actual yield ever exceed the theoretical yield in a pure reaction?

Example 4

medium

Two trials give actual yields of

18\text{ g}

and

22\text{ g}

for a reaction with theoretical yield

40\text{ g}

. What is the average percent yield?

Example 5

medium

A reaction has theoretical yield

0.25\text{ mol}

and actual yield

0.20\text{ mol}

(same product). What is the percent yield?

Example 6

medium

For

2H_2 + O_2 \rightarrow 2H_2O

0.60\text{ mol}

H_2

(excess

O_2

) gives an actual

9.0\text{ g}

of water (

M=18

). Find theoretical mass and percent yield.

Example 7

challenge

C_2H_4 + H_2 \rightarrow C_2H_6

. From

14.0\text{ g}

C_2H_4

(

M=28

) and excess

H_2

, the actual yield of ethane (

M=30

) is

13.5\text{ g}

. Determine the percent yield to three significant figures.

Example 8

medium

A process gives

90\text{ g}

actual yield at

75\%

percent yield. What was the theoretical yield?

Example 9

medium

Which of these can lower actual yield: incomplete reaction, side reactions, transfer losses, or all of these?

Example 10

medium

A reaction has theoretical yield

40\text{ g}

. The actual yield is

34\text{ g}

. What is the percent yield?

Example 11

medium

A reaction is expected to yield

25\text{ g}

product. If percent yield is

80\%

, what is the actual yield?

Example 12

medium

CaCO_3 \rightarrow CaO + CO_2

. A student heats

20.0\text{ g}

CaCO_3

(

M=100

) and weighs

9.52\text{ g}

CaO

(

M=56

). Find percent yield.

Example 13

medium

A reaction has a theoretical yield of

32\text{ g}

but loses

25\%

of the product during workup. What is the actual yield?

Example 14

hard

A reaction's theoretical yield is

12.0\text{ g}

. After purification,

9.6\text{ g}

98\%

-pure product is recovered. What is the percent yield of pure compound?

Example 15

hard

4Fe + 3O_2 \rightarrow 2Fe_2O_3

. Burning

11.2\text{ g}

Fe (

M=56

) in excess oxygen gives

14.4\text{ g}

Fe_2O_3

(

M=160

). Find percent yield.

Example 16

medium

2H_2 + O_2 \rightarrow 2H_2O

. From

4\text{ mol}

H_2

(excess

O_2

), the theoretical yield of water is computed, but only

3\text{ mol}

water forms. What is the actual yield in moles?

Example 17

medium

A reaction's actual yield is

45\text{ g}

and percent yield is

90\%

. By how many grams does the actual yield fall short of theoretical?

Example 18

hard

AgNO_3 + NaCl \rightarrow AgCl + NaNO_3

. Mixing

0.100\text{ mol}

AgNO_3

with excess

NaCl

yields

12.9\text{ g}

AgCl

(

M=143.5

). Compute percent yield.

Example 19

easy

A lab recovers

18\text{ g}

of product from a reaction. If percent yield is

90\%

, is

18\text{ g}

the actual or theoretical yield?

Example 20

hard

2KClO_3 \rightarrow 2KCl + 3O_2

. Heating

24.5\text{ g}

KClO_3

(

M=122.5

) gives

8.64\text{ g}

O_2

(

M=32

). Find percent yield.

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Related Concepts

Theoretical Yield Percent Yield