Free Printable Standard Stoichiometry and Percent Yield Review

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Standard Stoichiometry and Percent Yield Review

Total questions: 17

Worksheet time: 53mins

Name

Class

Date

How many moles of H₂ are needed to react with 2 moles of N₂according to the reaction?

N₂ + 3 H₂ → 2 NH₃

If 12.00 moles of NaClO₃ react, how many moles of O₂will be produced according to the reaction?

2 NaClO₃ → 2 NaCl + 3 O₂

12 moles of O₂

18 moles of O₂

9 moles of O₂

6 moles of O₂

2Na + 2H₂O → 2NaOH+ H₂

How many grams of H₂ are produced if 120 g of Na are available?

5.2 g

2.6 g

690 g

45 g

2Al + 3H₂SO₄ -> Al₂(SO₄)₃ + 3H₂
How many grams of aluminum sulfate would be formed if 250g H₂SO₄ completely reacted with aluminum?

0.85 g

290 g

450 g

870 g

For the reaction represented by the equation Cl₂ + 2KBr → Br₂ + 2KCl, how many grams of potassium chloride can be produced from 356 grams potassium bromide?

749 g

225 g

479 g

814 g

Balance the following reaction :

CaC₂(s) + H₂O(l) --> C₂H₂(g) + Ca(OH)₂(aq)

1,2,2,2

1,2,1,1

2,1,1,1

2,1,2,1

B₂H₆ + 3O₂ -->2 HBO₂ + 2 H₂O
What mass of O₂ will be needed to burn 36.1 g of B₂H₆?

13.8 g O₂

3.86 mol of O₂

124 g O₂

4 Al + 3 O₂ –> 2 Al₂O₃ How much aluminum would be needed to completely react with 45 grams of O₂?

1.05 moles

3.75 moles

1.875 grams

1.875 moles

Mole ratios are obtained from the

balanced chemical equation

periodic table

molar mass

10.

What is the mole ratio of H₂O to H₃PO₄ in the following chemical equation? P₄O₁₀ + 6 H₂O --> 4 H₃PO₄

6:4

4:6

1:3

3:1

11.

What is the formula for percent yield?

$\frac{Actual}{Theoretical}\times100$

$\frac{Theoretical}{Actual}\times100$

$\frac{Actual\times Theoretical}{100}$

$\frac{100}{Actual\times Theoretical}$

12.

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

13.

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

1.16%

116%

85%

76%

14.

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%

15.

In a lab, a scientist calculate he should produce 12.3 grams of product in his experiment. When he is finished collecting his product it weighs 10.1 grams. What is his percent yield?

82%

0.82%

10.1 %

100%

16.

The theoretical yield of a reaction is 237 grams, but the reaction actually yields 26 less grams than expected. What is the percent yield?

17.6%

82.4%

89.0%

121.3%

17.

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

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Standard Stoichiometry and Percent Yield Review

Total questions: 17

Worksheet time: 53mins

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