Free Printable Chemistry Chapter 12: Stoichiometry Test Practice

Worksheets

Chemistry Chapter 12: Stoichiometry Test Practice

Total questions: 50

Worksheet time: 3hrs 16mins

Name

Class

Date

Balance the following reaction:
Mg(s) + HCl(aq) --> MgCl₂(aq) + H₂(g)

1,2,1,2

2,1,1,2

1,2,1,1

1,2,2,2

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

Balance the following reaction:
C₂H₂(g) + O₂(g) --> CO₂(g) + H₂O(g)

4,10,2,1

2,5,4,2

1,2,2,1

4,10,2,2

What is the right ratio of chemicals for the BCE (Balanced Chemical Equation)?__Na + __H₂O --> __NaOH + __H₂

2,2 --> 2,1

4,4 --> 4,1

1,2 --> 2,4

1,2 --> 2,1

What is the right ratio of chemicals for the BCE (Balanced Chemical Equation)?__CO + __Fe₂O₃--> __Fe + __CO₂

3,1 --> 2,3

3,2 --> 1,1

3,2 --> 2,4

3,2 --> 2,1

Which of the following represent a mole ratio between silver nitrate and copper(II) nitrate in the following reaction:
2AgNO₃ + Cu --> Cu(NO₃)₂ + 2Ag

2 mol AgNO₃ / 2 mol Ag

2 mol Ag / 2 mol AgNO₃

2 mol AgNO₃ / 2 mol Cu(NO₃)₂

2 mol AgNO₃ / 1 mol Cu(NO₃)₂

4NH₃+ 5O₂-->4NO + 6H₂O
What is the total number of moles of H₂O produced when 12 mole of NH₃ is completely consumed?

2 C₂H₆ + 7 O₂ → 4 CO₂ + 6 H₂O

New problem: If 16 moles of carbon dioxide are formed by this reaction, how many moles of water were also produced?

4 mol H₂O

6 mol H₂O

24 mol H₂O

96 mol H₂O

For the following reaction, how many moles of silver is produced, if 10 moles of silver nitrate is completely reacted during the reaction?
2AgNO₃ + Cu --> Cu(NO₃)₂ + 2Ag

2 moles

2.5 moles

5 moles

10 moles

10.

N₂ + 3H₂ --> 2NH₃
How many moles of N₂is needed to react with 6 moles of H₂?

6.7

2.0

3.0

15.0

11.

What is the molar mass of fluorine gas?
(beware!)

18.998 g/mol

38 g/mol

9 g/mol

18 g/mol

12.

What is the molar mass of table salt (NaCl)?

116.886 g/mol

35.453 g/mol

22.990 g/mol

58.443 g/mol

13.

What is the molar mass of AuCl₃?

96 g

130 g

232.5 g

303.3 g

14.

What is the molar mass of CO₂ to the ones place?

15.

Calculate the molar mass of Ba(C₂H₃O₂)₂

255.3 g/mol

237.3 g/mol

228.3 g/mol

196.3 g/mol

16.

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

17.

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

18.

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

19.

Using the balanced chemical equation:

Mg + 2 HCl --> MgCl₂ + H₂

How many grams of MgCl₂ is produced if 4.67 moles of HCl react?

219 g MgCl₂

4.67 g MgCl₂

94 g MgCl₂

20.

Using the balanced chemical equation:

4NH₃ + 3O₂--> 2N₂ + 6H₂O

Determine the amount of grams of N₂ is produced if 4.03 moles of NH₃ react?

28.0 g N₂

56.4 g N₂

2.02 g N₂

21.

2Na + 2H₂O → 2NaOH+ H₂
How many grams of hydrogen are produced if 120 g of Na are available?

5.2 g

2.6 g

690 g

45 g

22.

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%

23.

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

1.16%

116%

85%

76%

24.

If 5.2 grams of Mn(SO₄)₂ are actually formed in the lab, what is the percent yield?

The calculated number of grams for Mn(SO₄)₂ is 6.30 grams

37%

48%

53%

83%

25.

2 Fe + 3 S --> Fe₂S₃

Given 52 grams Fe, solve for Fe₂S₃

214 grams

96 grams

208 grams

56 grams

26.

3 Zn + 2H₃PO₄ --> 3 H₂ + Zn₃(PO₄)₂

Given 23.1 grams Zn, Solve for H₃PO₄

12.6

65.4

23.1

46.2

27.

NH₃ + O₂ --> NO + H₂O.

Given 3.25 g of NH₃ and 3.50 g of O₂

_{Solve for the limiter}

O₂

NH₃

28.

NH₃ + O₂ --> NO + H₂O.

Given 3.25 g of NH₃ and 3.50 g of O₂

_{Solve for NO}

2.0 g

2.63 g

5.16 g

5.63 g

29.

NH₃ + O₂ --> NO + H₂O.

Given 3.25 g of NH₃ and 3.50 g of O₂

_{How much excess reactant remains}

2.63 g

.25 g

6.75 g

1.76 g

30.

Using the balanced equation below

Mg(s) + 2HCl(aq) --> MgCl₂(aq) + H₂(g)

How many grams of HCl are consumed by the reaction of 2.50 moles of magnesium?

5.00 g

7.29

182 g

218 g

31.

Using the balanced equation below,

Mg(s) + 2HCl(aq) --> MgCl₂(aq) + H₂(g)

What is the mass in grams of H₂ gas when 4.0 moles of HCl is added to the reaction?

0.99 g

4.0 g

2.0 g

6.0 g

32.

Using the balanced equation below,

Mg(s) + 2HCl(aq) --> MgCl₂(aq) + H₂(g)

How many moles of HCl are consumed in the production of 7.5 moles of MgCl₂?

3.8 moles

15 moles

7.5 moles

23 moles

33.

Using the balanced equation below,

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

how many moles of Ca(OH)₂ would be produced if 3.5 moles of H₂O are consumed?

1.75 moles

7.0 moles

3.5 moles

11 moles

34.

N₂ + 3H₂ −-> 2NH₃
How many moles of hydrogen are needed to react with 2 moles of nitrogen?

35.

2 KClO₃ → 2 KCl + 3 O₂
How many moles of oxygen are produced when 6.7 moles of KClO₃ decompose completely?

6.7 mol

1.0 mol

10.1 mol

4.5 mol

36.

If 4 mol of HCl react, how many mol of hydrogen gas are produced?

(a) moles of H₂

37.

Your percent yield is 80%. The actual amount of product produced was 29.1 grams. What is the theoretical yield?

25.2 grams

37.3 grams

37.1 grams

36.3 grams

38.

How many moles are 2.85 x 10¹⁸ atoms of iron?

4.73 x 10^-6 moles

1.72 x 10⁴² moles

39.

How many molecules are in 2.5 mol of NaCl?

1.51x10²³

146

4.15

1.51x10²⁴

40.

How many molecules are present in 135 g of Teflon C₂F₄

6.13 x 10²³ molecules

5.13 x 10²³ molecules

8.13 x 10 ²³ molecules

9.13 x 10²³ molecules

41.

If I have 2.4 x 10²⁴atoms of platinum, how many moles of platinum do I have?

6.02 x 10²³moles

4 moles

8 moles

6 moles

42.

What is the molar mass of ammonium sulfide - (NH₄)₂S?

68.17 g/mol

40.02 g/mol

114.12 g/mol

82.91 g/mol

43.

For the following reaction, how many moles of copper is need to produce 8 moles of silver?
2AgNO₃ + Cu --> Cu(NO₃)₂ + 2Ag

1 moles

2 moles

4 moles

8 moles

44.

2 NaClO₃ (s) --> 2NaCl (s) +3 O₂ (g)

12.00 moles of NaClO₃ will produce how many grams of O₂?

256 g of O₂

576 g of O₂

288 g O₂

32 g O₂

45.

2Al + 6HCl --> 2AlCl₃ + 3H₂

Aluminium reacts with hydrochloric acid. How many grams of aluminum are necessary to produce 11 L of hydrogen gas at STP?

8.8

0.99

1.0

46.

1Mg + 2H₂O --> Mg(OH)₂ + H₂

What volume of hydrogen will be produced at STP by the reaction 67.3 g of magnesium?

62.0 L

0.12 L

2.77 L

1.15 L

47.

The reaction of 5.0 grams of fluorine with excess chlorine produced 5.6 grams of ClF₃. What percent yield of ClF₃ was obtained?

Cl₂ + 3F₂ → 2ClF₃

58%

69%

76%

86%

48.

How do I move from grams to moles

multiply by molar mass

divide by molar mass

multiply by Avo number

divided by Avo number

49.

SiO₂ + 3C → SiC + 2CO
I need to add 8 moles of Carbon to the reaction. How many grams of Carbon should I weigh?

_{96 g}

0.67 g

2.67 g

48 g

50.

What is the first thing you must do to solve a stoichiometry problem?

Write a Balanced Equation

Panic

Write an Unbalanced Equation

Ask for help

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Chemistry Chapter 12: Stoichiometry Test Practice

Total questions: 50

Worksheet time: 3hrs 16mins

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