Free Printable Percent Yield Calculations in Chemistry

Worksheets

Percent Yield Calculations in Chemistry

Total questions: 27

Worksheet time: 2hrs 6mins

Name

Class

Date

CH₄ + 2O₂ → CO₂ + 2H₂O
24 grams of CH₄ was added to the above reaction. Calculate the theoretical yield of CO₂.

66 grams

132 grams

33 grams

8.72

The ______________ yield is the maximum amount of product possible in a reaction. This determines the amount of product that should be produced in a perfect setting

Percent

actual

stoichiometry

theoretical

2Fe₂O₃ + 3C → 4Fe + 3CO₂

You add 28 grams of carbon. You find the actual yield to be 81.2 grams of CO₂. What is the percent yield of CO₂? (Hint: calculate theoretical yield of CO₂ first)

58.83%

30.8%

64.35%

79.61%

Theoretical yield = 73g
Actual yield = 62g
Calculate the percent yield.

1.16%

116%

85%

76%

P₄+ 6Cl₂--> 4PCl₃The reaction of 75.0g P₄ with excess chlorine gas produces 110g PCl₃in lab. Calculate percent yield for the reaction.

(Hint: calculate the theoretical yield of PCl₃ first)

78%

64%

27%

33%

Lead nitrate can be decomposed by heating. What is the % yield of the decomposition reaction if 7.4g Pb(NO₃)₂ are heated to give 4.1 g PbO?
2Pb(NO₃)_{2 (s)}→2PbO_(s)+4NO_2(g)+O_2(g)

82%

44%

56%

67%

What is the formula for percent yield?

$\frac{actual\ yield}{theoretical\ yield}\times100$

$\frac{theoretical\ yield}{actual\ yield}\times100$

$\frac{moles\ A}{moles\ B}$

$\frac{grams\ A}{grams\ B}$

If you are converting from grams of substance A to grams of substance B, drag the correct order of the conversion process:

(a) ---> (b) ---> (c) ---> (d)

Choose from the below words

Grams A

Moles A

Moles B

Grams B

Based on the following equation and question, choose the actual yield:

$Zn\ \ +\ \ 2HCl\ \ \ \rightarrow\ \ \ ZnCl_2\ \ +\ \ H_2$

4.82 g of $ZnCl_2$ (136.286 g/mol) is formed in a lab. What is percent yield if 10 g of HCl (36.453 g/mol) is consumed?

44.5%

35.4%

10.6 %

26.8 %

10.

Calculate percent yield based on the following information:

Actual Yield: 50

Theoretical Yield: 60

0.8333 %

83.33 %

120 %

1.2 %

11.

Which of the following do you get through measuring its mass? (No calculations)

percent yield

theoretical yield

actual yield

limiting reagent

12.

Which of the following reactions has the lowest percent yield?

Theoretical yield 25.7 g; actual yield 23.2 g

Theoretical yield 42.1 g; actual yield 39.9 g

Theoretical yield 18.2 g; actual yield 15.6 g

Theoretical yield 93.4 g; actual yield 87.9 g

13.

List one reason why the actual yield is lower than the theoretical yield.

(a)

14.

List one reason why the theoretical yield is less than the actual yield

(a)

15.

When two substances react to form products, the reactant which is used up is called the_____.

excess reactant

limiting reactant

catalytic reactant

determining reactant

16.

In a reaction, 9 grams of a substance are produced. The theoretical yield was 10 grams. What is the percentage yield?

80%

85%

90%

95%

17.

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

18.

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

19.

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

20.

In Chemistry, "yield" means

To allow another chemical to go first

To make way for more chemicals

The products of a chemical reaction

What is made as a result of a chemical reaction

21.

The reaction of 25.0 g benzene, C₆H₆, with excess HNO₃ resulted in 21.4 g C₆H₅NO₂. What is the percentage yield?

C₆H₆ + HNO₃ → C₆H₅NO₂ + H₂O

100%

27.39%

54.29%

85.62%

22.

Lead nitrate can be decomposed by heating. What is the % yield of the decomposition reaction if 7.4g Pb(NO₃)₂ are heated to give 4.1 g PbO?
2Pb(NO₃)_{2 (s)}→2PbO_(s)+4NO_2(g)+O_2(g)

82%

44%

56%

67%

23.

CH₄ + 2O₂ → CO₂ + 2H₂O
24 grams of CH₄ was added to the above reaction. Calculate the theoretical yield of CO₂.

66 grams

132 grams

33 grams

8.72

24.

When reacting Na with Cl₂, we calculated that the theoretical yield should be 13 grams. Our actual yield was 12.5 grams. What is the percent yield?

90.4%

104%

96.15%

1.04%

25.

2Fe₂O₃ + C → Fe + 3CO₂

You add 28 grams of carbon. You find the actual yield to be 181.2 grams of CO₂. What is the percent yield of CO₂? (Hint: calculate theoretical yield of CO₂ first)

58.83%

308%

6435%

15.5

26.

The limiting reactant

slows the reaction down

is used up first

is the reactant that is left over

controls the speed of the reaction

27.