Question 1

When a hydrocarbon burns in air, what component of air reacts?

Accepted Answer

A) oxygen 
B) nitrogen 
C) carbon dioxide 
D) water 
E) argon 
A) oxygen 
B) nitrogen 
C) carbon dioxide 
D) water 
E) argon

Question 2

Complete and balance the following reaction, given that elemental rubidium reacts with elemental sulfur to form Rb2S (s).
Na (s)+ S (s)→ __________

Accepted Answer

Question 3

GeF3H is formed from GeH4 and GeF4 in the combination reaction: GeH4 + 3Ge F4 → 4GeF3H
If the reaction yield is 92.6%, how many moles of GeF4 are needed to produce 8.00 mol of GeF3H?

Accepted Answer

A) 3.24 
B) 5.56 
C) 6.48 
D) 2.78 
E) 2.16 
A) 3.24 
B) 5.56 
C) 6.48 
D) 2.78 
E) 2.16

Question 4

Silver nitrate and aluminum chloride react with each other by exchanging anions: 3AgNO3 (aq)+ AlCl3 (aq)→ Al(NO3)3 (aq)+ 3AgCl (s)
What mass in grams of AgCl is produced when 4.22 g of AgNO3 react with 7.73 g of AlCl3?

Accepted Answer

A) 17.6 
B) 4.22 
C) 24.9 
D) 3.56 
E) 11.9 
A) 17.6 
B) 4.22 
C) 24.9 
D) 3.56 
E) 11.9

Question 5

The compound responsible for the characteristic smell of garlic is allicin, C6H10OS2. The mass of 1.00 mol of allicin, rounded to the nearest integer, is __________ g.

Accepted Answer

A) 34 
B) 162 
C) 86 
D) 61 
E) 19 
A) 34 
B) 162 
C) 86 
D) 61 
E) 19

Question 6

The molecular weight of the ethanol (C2H5OH), rounded to the nearest integer, is __________ amu.

Accepted Answer

A) 34 
B) 41 
C) 30 
D) 46 
E) 92 
A) 34 
B) 41 
C) 30 
D) 46 
E) 92

Question 7

The formula weight of silver chromate (Ag2CrO4)is __________ amu.

Accepted Answer

A) 159.87 
B) 223.87 
C) 331.73 
D) 339.86 
E) 175.87 
A) 159.87 
B) 223.87 
C) 331.73 
D) 339.86 
E) 175.87

Question 8

The combustion of ammonia in the presence of oxygen yields NO2 and H2O: 4 NH3 (g)+ 7 O2 (g)→ 4 NO2 (g)+ 6 H2O (g)
The combustion of 43.9 g of ammonia with 258 g of oxygen produces __________ g of NO2.

Accepted Answer

A) 212 
B) 178 
C) 119 
D) 0.954 
E) 43.9 
A) 212 
B) 178 
C) 119 
D) 0.954 
E) 43.9

Question 9

How many molecules of CH4 are in 48.2 g of this compound?

Accepted Answer

A) 5.00 × 1024 
B) 3.00 
C) 2.90 × 1025 
D) 1.81 × 1024 
E) 4.00 
A) 5.00 × 1024 
B) 3.00 
C) 2.90 × 1025 
D) 1.81 × 1024 
E) 4.00

Question 10

The molecular weight of acetic acid ( HC2H3O2), the acid in vinegar, is __________ amu (rounded to one decimal place).

Accepted Answer

A) 59.0 
B) 29.0 
C) 60.1 
D) 8.0 
E) 32.0 
A) 59.0 
B) 29.0 
C) 60.1 
D) 8.0 
E) 32.0

Question 11

There are __________ mol of carbon atoms in 4 mol C4H8O2.

Accepted Answer

A) 4 
B) 8 
C) 16 
D) 20 
E) 32 
A) 4 
B) 8 
C) 16 
D) 20 
E) 32

Question 12

What is the coefficient of O2 when the following equation is completed and balanced? C4H8O2 + O2 → __________

Accepted Answer

A) 2 
B) 3 
C) 5 
D) 6 
E) 1 
A) 2 
B) 3 
C) 5 
D) 6 
E) 1

Question 13

Which one of the following substances is the product of this combination reaction? Al (s)+ I2 (s)→ __________

Accepted Answer

A) AlI2 
B) AlI 
C) AlI3 
D) Al2I3 
E) Al3I2 
A) AlI2 
B) AlI 
C) AlI3 
D) Al2I3 
E) Al3I2

Question 14

How many sulfur dioxide molecules are there in 0.180 mol of sulfur dioxide?

Accepted Answer

A) 1.80 × 1023 
B) 6.02 × 1024 
C) 6.02 × 1023 
D) 1.08 × 1024 
E) 1.08 × 1023 
A) 1.80 × 1023 
B) 6.02 × 1024 
C) 6.02 × 1023 
D) 1.08 × 1024 
E) 1.08 × 1023

Question 15

The mass % of Al in aluminum sulfate (Al2(SO4)3)is __________.

Accepted Answer

A) 7.886 
B) 15.77 
C) 21.93 
D) 45.70 
E) 35.94 
A) 7.886 
B) 15.77 
C) 21.93 
D) 45.70 
E) 35.94

Question 16

When the following equation is balanced, the coefficient of O2 is __________. C2H4O (g)+ O2 (g)→ CO2 (g)+ H2O (g)

Accepted Answer

A) 2 
B) 3 
C) 4 
D) 5 
E) 1 
A) 2 
B) 3 
C) 4 
D) 5 
E) 1

Question 17

When the following equation is balanced, the coefficient of water is __________. K (s)+ H2O (l)→ KOH (aq)+ H2 (g)

Accepted Answer

A) 1 
B) 2 
C) 3 
D) 4 
E) 5 
A) 1 
B) 2 
C) 3 
D) 4 
E) 5

Question 18

A compound that is composed of only carbon and hydrogen contains 80.0% C and 20.0% H by mass. What is the empirical formula of the compound?

Accepted Answer

A) C20H60 
B) C7H20 
C) C H3 
D) C2H6 
E) CH4 
A) C20H60 
B) C7H20 
C) C H3 
D) C2H6 
E) CH4

Question 19

The combustion of ammonia in the presence of excess oxygen yields NO2 and H2O: 4 NH3 (g)+ 7 O2 (g)→ 4 NO2 (g)+ 6 H2O (g)
The combustion of 57.6 g of ammonia consumes __________ g of oxygen.

Accepted Answer

A) 27.0 
B) 28.8 
C) 54.1 
D) 189 
E) 94.6 
A) 27.0 
B) 28.8 
C) 54.1 
D) 189 
E) 94.6

Question 20

Pentacarbonyliron (Fe(CO)5)reacts with phosphorous trifluoride (PF3)and hydrogen, releasing carbon monoxide: Fe(CO)5 + PF3 + H2 → Fe(CO)2(PF3)2(H)2 + CO (not balanced)
The reaction of 5.0 mol of Fe(CO)5, 8.0 mol of PF3and 6.0 mol of H2 will release __________ mol of CO.

Accepted Answer

A) 15 
B) 5.0 
C) 24 
D) 6.0 
E) 12 
A) 15 
B) 5.0 
C) 24 
D) 6.0 
E) 12

Exam 3: Stoichiometry: Calculations With Chemical Formulas and Equations

When a hydrocarbon burns in air, what component of air reacts?

Complete and balance the following reaction, given that elemental rubidium reacts with elemental sulfur to form Rb2S (s). Na (s)+ S (s)→ __________

GeF3H is formed from GeH4 and GeF4 in the combination reaction: GeH4 + 3Ge F4 → 4GeF3H If the reaction yield is 92.6%, how many moles of GeF4 are needed to produce 8.00 mol of GeF3H?

Silver nitrate and aluminum chloride react with each other by exchanging anions: 3AgNO3 (aq)+ AlCl3 (aq)→ Al(NO3)3 (aq)+ 3AgCl (s) What mass in grams of AgCl is produced when 4.22 g of AgNO3 react with 7.73 g of AlCl3?

The compound responsible for the characteristic smell of garlic is allicin, C6H10OS2. The mass of 1.00 mol of allicin, rounded to the nearest integer, is __________ g.

The molecular weight of the ethanol (C2H5OH), rounded to the nearest integer, is __________ amu.

The formula weight of silver chromate (Ag2CrO4)is __________ amu.

The combustion of ammonia in the presence of oxygen yields NO2 and H2O: 4 NH3 (g)+ 7 O2 (g)→ 4 NO2 (g)+ 6 H2O (g) The combustion of 43.9 g of ammonia with 258 g of oxygen produces __________ g of NO2.

How many molecules of CH4 are in 48.2 g of this compound?

The molecular weight of acetic acid ( HC2H3O2), the acid in vinegar, is __________ amu (rounded to one decimal place).

There are __________ mol of carbon atoms in 4 mol C4H8O2.

What is the coefficient of O2 when the following equation is completed and balanced? C4H8O2 + O2 → __________

Which one of the following substances is the product of this combination reaction? Al (s)+ I2 (s)→ __________

How many sulfur dioxide molecules are there in 0.180 mol of sulfur dioxide?

The mass % of Al in aluminum sulfate (Al2(SO4)3)is __________.

When the following equation is balanced, the coefficient of O2 is __________. C2H4O (g)+ O2 (g)→ CO2 (g)+ H2O (g)

When the following equation is balanced, the coefficient of water is __________. K (s)+ H2O (l)→ KOH (aq)+ H2 (g)

A compound that is composed of only carbon and hydrogen contains 80.0% C and 20.0% H by mass. What is the empirical formula of the compound?

The combustion of ammonia in the presence of excess oxygen yields NO2 and H2O: 4 NH3 (g)+ 7 O2 (g)→ 4 NO2 (g)+ 6 H2O (g) The combustion of 57.6 g of ammonia consumes __________ g of oxygen.

Pentacarbonyliron (Fe(CO)5)reacts with phosphorous trifluoride (PF3)and hydrogen, releasing carbon monoxide: Fe(CO)5 + PF3 + H2 → Fe(CO)2(PF3)2(H)2 + CO (not balanced) The reaction of 5.0 mol of Fe(CO)5, 8.0 mol of PF3and 6.0 mol of H2 will release __________ mol of CO.

Introduction: Matter and Measurement

Atoms, Molecules, and Ions

Aqueous Reactions and Solution Stoichiometry

Thermochemistry

Electronic Structure of Atoms

Periodic Properties of the Elements

Basic Concepts of Chemical Bonding

Molecular Geometry and Bonding Theories

Gases

Liquids and Intermolecular Forces

Solids and Modern Materials

Properties of Solutions

Chemical Kinetics

Chemical Equilibrium

Acid-Base Equilibria

Additional Aspects of Aqueous Equilibria

Chemistry of the Environment

Chemical Thermodynamics

Electrochemistry

Nuclear Chemistry

Chemistry of the Nonmetals

Transition Metals and Coordination Chemistry

The Chemistry of Life: Organic and Biological Chemistry

Filters

Complete and balance the following reaction, given that elemental rubidium reacts with elemental sulfur to form Rb₂S (s). Na (s)+ S (s)→ __________

GeF₃H is formed from GeH₄ and GeF₄ in the combination reaction: GeH₄ + 3Ge F₄ → 4GeF₃H If the reaction yield is 92.6%, how many moles of GeF₄ are needed to produce 8.00 mol of GeF₃H?

Silver nitrate and aluminum chloride react with each other by exchanging anions: 3AgNO₃ (aq)+ AlCl₃ (aq)→ Al(NO₃)₃ (aq)+ 3AgCl (s) What mass in grams of AgCl is produced when 4.22 g of AgNO₃ react with 7.73 g of AlCl₃?

The compound responsible for the characteristic smell of garlic is allicin, C₆H₁₀OS₂. The mass of 1.00 mol of allicin, rounded to the nearest integer, is __________ g.

The molecular weight of the ethanol (C₂H₅OH), rounded to the nearest integer, is __________ amu.

The formula weight of silver chromate (Ag₂CrO₄)is __________ amu.

The combustion of ammonia in the presence of oxygen yields NO₂ and H₂O: 4 NH₃ (g)+ 7 O₂ (g)→ 4 NO₂ (g)+ 6 H₂O (g) The combustion of 43.9 g of ammonia with 258 g of oxygen produces __________ g of NO₂.

How many molecules of CH₄ are in 48.2 g of this compound?

The molecular weight of acetic acid ( HC₂H₃O₂), the acid in vinegar, is __________ amu (rounded to one decimal place).

There are __________ mol of carbon atoms in 4 mol C₄H₈O₂.

What is the coefficient of O₂ when the following equation is completed and balanced? C₄H₈O₂ + O₂ → __________

Which one of the following substances is the product of this combination reaction? Al (s)+ I₂ (s)→ __________

The mass % of Al in aluminum sulfate (Al₂(SO₄)₃)is __________.

When the following equation is balanced, the coefficient of O₂ is __________. C₂H₄O (g)+ O₂ (g)→ CO₂ (g)+ H₂O (g)

When the following equation is balanced, the coefficient of water is __________. K (s)+ H₂O (l)→ KOH (aq)+ H₂ (g)

The combustion of ammonia in the presence of excess oxygen yields NO₂ and H₂O: 4 NH₃ (g)+ 7 O₂ (g)→ 4 NO₂ (g)+ 6 H₂O (g) The combustion of 57.6 g of ammonia consumes __________ g of oxygen.

Pentacarbonyliron (Fe(CO)₅)reacts with phosphorous trifluoride (PF₃)and hydrogen, releasing carbon monoxide: Fe(CO)₅ + PF₃ + H₂ → Fe(CO)₂(PF₃)₂(H)₂ + CO (not balanced) The reaction of 5.0 mol of Fe(CO)₅, 8.0 mol of PF₃and 6.0 mol of H₂ will release __________ mol of CO.