Question 1

Calculate the percentage by mass of oxygen in Pb(NO3)2.

Accepted Answer

A) 9.7 
B) 14.5 
C) 19.3 
D) 29.0 
E) 33.4 
A) 9.7 
B) 14.5 
C) 19.3 
D) 29.0 
E) 33.4

Question 2

Calcium carbide (CaC2)reacts with water to produce acetylene (C2H2): CaC2 (s)+ 2H2O (g)→ Ca(OH)2 (s)+ C2H2 (g)
Production of 13 g of C2H2 requires consumption of ________ g of H2O.

Accepted Answer

A) 4.5 
B) 9.0 
C) 18 
D) 4.8 × 102 
E) 4.8 × 10-2 
A) 4.5 
B) 9.0 
C) 18 
D) 4.8 × 102 
E) 4.8 × 10-2

Question 3

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 4

The formula weight of LiClO4 is ________ amu.

Accepted Answer

A) 212.3 
B) 101.0 
C) 52.0 
D) 106.3 
E) 58.3 
A) 212.3 
B) 101.0 
C) 52.0 
D) 106.3 
E) 58.3

Question 5

The combustion of propane (C3H8)produces CO2 and H2O: C3H8 (g)+ 5O2 (g)→ 3CO2 (g)+ 4H2O (g)
The reaction of 2.5 mol of O2 with 4.6 mol of C3H8 will produce ________ mol of H2O.

Accepted Answer

A) 4.0 
B) 1.25 
C) 2.5 
D) 2.0 
E) 18.4 
A) 4.0 
B) 1.25 
C) 2.5 
D) 2.0 
E) 18.4

Question 6

What is the mass % of carbon in dimethylsulfoxide (C2H6SO)rounded to three significant figures?

Accepted Answer

A) 15.4 
B) 19.7 
C) 30.7 
D) 7.74 
E) 20.5 
A) 15.4 
B) 19.7 
C) 30.7 
D) 7.74 
E) 20.5

Question 7

The combustion of propane (C3H8)produces CO2 and H2O: C3H8 (g)+ 5O2 (g)→ 3CO2 (g)+ 4H2O (g)
The reaction of 2.5 mol of O2 will produce ________ mol of H2O.

Accepted Answer

A) 4.0 
B) 3.0 
C) 2.5 
D) 2.0 
E) 1.0 
A) 4.0 
B) 3.0 
C) 2.5 
D) 2.0 
E) 1.0

Question 8

When the following equation is balanced,the coefficients are ________. C8H18 + O2 → CO2 + H2O

Accepted Answer

A) 2, 3, 4, 4 
B) 1, 4, 8, 9 
C) 2, 12, 8, 9 
D) 4, 4, 32, 36 
E) 2, 25, 16, 18 
A) 2, 3, 4, 4 
B) 1, 4, 8, 9 
C) 2, 12, 8, 9 
D) 4, 4, 32, 36 
E) 2, 25, 16, 18

Question 9

Combustion of a 1.031-g sample of a compound containing only carbon,hydrogen,and oxygen produced   of CO2 and   of H2O.What is the empirical formula of the compound?

Accepted Answer

A) C3H8O 
B) C3H5O 
C) C12H16O5 
D) C3H9O3 
E) C3H6O3 
A) C3H8O 
B) C3H5O 
C) C12H16O5 
D) C3H9O3 
E) C3H6O3

Question 10

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

Accepted Answer

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

Question 11

What is the maximum mass in grams of NH3 that can be produced by the reaction of   of N2 with   of H2 via the equation below?
N2 (g)+ H2 (g)→ NH3 (g)(not balanced)

Accepted Answer

A) 2.0 
B) 1.2 
C) 0.61 
D) 17 
E) 4.0 
A) 2.0 
B) 1.2 
C) 0.61 
D) 17 
E) 4.0

Question 12

The formula weight of Zn(ClO4)2 is ________ amu.

Accepted Answer

A) 164.7 
B) 327.9 
C) 228.6 
D) 264.3 
E) 116.7 
A) 164.7 
B) 327.9 
C) 228.6 
D) 264.3 
E) 116.7

Question 13

What is the mass percent of C in carbonic acid (H2CO3).

Accepted Answer

Question 14

The mass % of C in methane (CH4)is ________.

Accepted Answer

A) 25.13 
B) 133.6 
C) 74.87 
D) 92.26 
E) 7.743 
A) 25.13 
B) 133.6 
C) 74.87 
D) 92.26 
E) 7.743

Question 15

Sulfur and fluorine react in a combination reaction to produce sulfur hexafluoride: S (s)+ 3F2(g)→ SF6 (g)
The maximum amount of SF6 that can be produced from the reaction of 32.1 g of sulfur with   of fluorine is ________ g.

Accepted Answer

A) 584 
B) 438 
C) 146 
D) 48.7 
E) 219 
A) 584 
B) 438 
C) 146 
D) 48.7 
E) 219

Question 16

Of the reactions below,which one is a decomposition reaction?

Accepted Answer

A) NH4Cl → NH3 + HCl 
B) 2Mg + O2 → 2MgO 
C) 2N2 + 3H2 → 2NH3 
D) 2CH4 + 4O2 → 2CO2 + 4H2O 
E) Cd(NO3)2 + Na2S → CdS + 2NaNO3 
A) NH4Cl → NH3 + HCl 
B) 2Mg + O2 → 2MgO 
C) 2N2 + 3H2 → 2NH3 
D) 2CH4 + 4O2 → 2CO2 + 4H2O 
E) Cd(NO3)2 + Na2S → CdS + 2NaNO3

Question 17

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 43.9 g of ammonia produces ________ g of NO2.

Accepted Answer

A) 2.58 
B) 178 
C) 119 
D) 0.954 
E) 43.9 
A) 2.58 
B) 178 
C) 119 
D) 0.954 
E) 43.9

Question 18

When the following equation is balanced,the coefficient of Al2O3 is ________. Al2O3 (s)+ C (s)+ Cl2 (g)→ AlCl3 (s)+ CO (g)

Accepted Answer

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

Question 19

Calculate the percentage by mass of lead in Pb(NO3)2.

Accepted Answer

A) 38.6 
B) 44.5 
C) 62.6 
D) 65.3 
E) 71.2 
A) 38.6 
B) 44.5 
C) 62.6 
D) 65.3 
E) 71.2

Question 20

What is the empirical formula of a compound that contains 29% Na,41% S,and 30% O by mass?

Accepted Answer

A) Na2S2O3 
B) NaSO2 
C) NaSO 
D) NaSO3 
E) Na2S2O6 
A) Na2S2O3 
B) NaSO2 
C) NaSO 
D) NaSO3 
E) Na2S2O6

Exam 3: Chemical Reactions and Reaction Stoichiometry

Calculate the percentage by mass of oxygen in Pb(NO3)2.

Calcium carbide (CaC2)reacts with water to produce acetylene (C2H2): CaC2 (s)+ 2H2O (g)→ Ca(OH)2 (s)+ C2H2 (g) Production of 13 g of C2H2 requires consumption of ________ g of H2O.

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

The formula weight of LiClO4 is ________ amu.

The combustion of propane (C3H8)produces CO2 and H2O: C3H8 (g)+ 5O2 (g)→ 3CO2 (g)+ 4H2O (g) The reaction of 2.5 mol of O2 with 4.6 mol of C3H8 will produce ________ mol of H2O.

What is the mass % of carbon in dimethylsulfoxide (C2H6SO)rounded to three significant figures?

The combustion of propane (C3H8)produces CO2 and H2O: C3H8 (g)+ 5O2 (g)→ 3CO2 (g)+ 4H2O (g) The reaction of 2.5 mol of O2 will produce ________ mol of H2O.

When the following equation is balanced,the coefficients are ________. C8H18 + O2 → CO2 + H2O

Combustion of a 1.031-g sample of a compound containing only carbon,hydrogen,and oxygen produced of CO2 and of H2O.What is the empirical formula of the compound?

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

What is the maximum mass in grams of NH3 that can be produced by the reaction of of N2 with of H2 via the equation below? N2 (g)+ H2 (g)→ NH3 (g)(not balanced)

The formula weight of Zn(ClO4)2 is ________ amu.

What is the mass percent of C in carbonic acid (H2CO3).

The mass % of C in methane (CH4)is ________.

Sulfur and fluorine react in a combination reaction to produce sulfur hexafluoride: S (s)+ 3F2(g)→ SF6 (g) The maximum amount of SF6 that can be produced from the reaction of 32.1 g of sulfur with of fluorine is ________ g.

Of the reactions below,which one is a decomposition reaction?

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 43.9 g of ammonia produces ________ g of NO2.

When the following equation is balanced,the coefficient of Al2O3 is ________. Al2O3 (s)+ C (s)+ Cl2 (g)→ AlCl3 (s)+ CO (g)

Calculate the percentage by mass of lead in Pb(NO3)2.

What is the empirical formula of a compound that contains 29% Na,41% S,and 30% O by mass?

Introduction: Matter, energy, and Measurement

Atoms, molecules, and Ions

Reactions in Aqueous Solution

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

Calculate the percentage by mass of oxygen in Pb(NO₃)₂.

Calcium carbide (CaC₂)reacts with water to produce acetylene (C₂H₂): CaC₂ (s)+ 2H₂O (g)→ Ca(OH)₂ (s)+ C₂H₂ (g) Production of 13 g of C₂H₂ requires consumption of ________ g of H₂O.

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

The formula weight of LiClO₄ is ________ amu.

The combustion of propane (C₃H₈)produces CO₂ and H₂O: C₃H₈(g)+ 5O₂ (g)→ 3CO₂ (g)+ 4H₂O (g) The reaction of 2.5 mol of O₂with 4.6 mol of C₃H₈will produce ________ mol of H₂O.

What is the mass % of carbon in dimethylsulfoxide (C₂H₆SO)rounded to three significant figures?

The combustion of propane (C₃H₈)produces CO₂ and H₂O: C₃H₈ (g)+ 5O₂(g)→ 3CO₂ (g)+ 4H₂O (g) The reaction of 2.5 mol of O₂ will produce ________ mol of H₂O.

When the following equation is balanced,the coefficients are ________. C₈H₁₈ + O₂ → CO₂ + H₂O

Combustion of a 1.031-g sample of a compound containing only carbon,hydrogen,and oxygen produced of CO₂ and of H₂O.What is the empirical formula of the compound?

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

What is the maximum mass in grams of NH₃ that can be produced by the reaction of of N₂ with of H₂ via the equation below? N₂ (g)+ H₂ (g)→ NH₃ (g)(not balanced)

The formula weight of Zn(ClO₄)₂ is ________ amu.

What is the mass percent of C in carbonic acid (H₂CO₃).

The mass % of C in methane (CH₄)is ________.

Sulfur and fluorine react in a combination reaction to produce sulfur hexafluoride: S (s)+ 3F₂(g)→ SF₆ (g) The maximum amount of SF₆ that can be produced from the reaction of 32.1 g of sulfur with of fluorine is ________ g.

The combustion of ammonia in the presence of excess oxygen yields NO₂and H₂O: 4 NH₃(g)+ 7 O₂(g)→ 4 NO₂ (g)+ 6 H₂O (g) The combustion of 43.9 g of ammonia produces ________ g of NO₂.

When the following equation is balanced,the coefficient of Al₂O₃ is ________. Al₂O₃(s)+ C (s)+ Cl₂ (g)→ AlCl₃(s)+ CO (g)

Calculate the percentage by mass of lead in Pb(NO₃)₂.