Question 1

When the following equation is balanced,the coefficient of H2S is ________. FeCl3 (aq)+ H2S (g)→ Fe2S3 (s)+ HCl (aq)

Accepted Answer

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

Question 2

Propane (C3H8)reacts with oxygen in the air to produce carbon dioxide and water.In a particular experiment,38.0 grams of carbon dioxide are produced from the reaction of 22.05 grams of propane with excess oxygen.What is the % yield in this reaction?

Accepted Answer

A) 38.0 
B) 57.6 
C) 66.0 
D) 86.4 
E) 94.5 
A) 38.0 
B) 57.6 
C) 66.0 
D) 86.4 
E) 94.5 B

Question 3

Which of the following contains the largest number of atoms in mole?

Accepted Answer

A) S8 
B) C4H10 
C) Al2(SO4)3 
D) Na3PO4 
E) Cl2 
A) S8 
B) C4H10 
C) Al2(SO4)3 
D) Na3PO4 
E) Cl2 C

Question 4

What is the mass % of oxygen in lead (II)nitrate (Pb(NO3)2)rounded to three significant figures?

Accepted Answer

A) 4.83 
B) 19.3 
C) 29.0 
D) 14.5 
E) 0.331 
A) 4.83 
B) 19.3 
C) 29.0 
D) 14.5 
E) 0.331

Question 5

Magnesium burns in air with a dazzling brilliance to produce magnesium oxide: 2Mg (s)+ O2(g)→ 2MgO (s)
How many moles of O2 are consumed when 3.55 mol of magnesium burns?

Accepted Answer

A) 0.146 
B) 0.563 
C) 3.55 
D) 7.10 
E) 1.78 
A) 0.146 
B) 0.563 
C) 3.55 
D) 7.10 
E) 1.78

Question 6

There are ________ molecules of methane in 0.123 mol of methane (CH4).

Accepted Answer

A) 5 
B) 2.46 × 10-2 
C) 2.04 × 10-25 
D) 7.40 × 1022 
E) 0.615 
A) 5 
B) 2.46 × 10-2 
C) 2.04 × 10-25 
D) 7.40 × 1022 
E) 0.615

Question 7

How many grams of hydrogen are in 46 g of CH4O?

Accepted Answer

A) 5.8 
B) 1.5 
C) 2.8 
D) 0.36 
E) 180 
A) 5.8 
B) 1.5 
C) 2.8 
D) 0.36 
E) 180

Question 8

A compound was found to contain 90.6% lead (Pb)and 9.4% oxygen.The empirical formula for this compound is ________.

Accepted Answer

The answer of A compound was found to contain 90.6%...

Question 9

What is the total number of atoms in 0.139 mol of Fe(OH2)63+?

Accepted Answer

A) 19.0 
B) 1.59 × 1024 
C) 8.37 × 1022 
D) 2.64 
E) 1.84 × 1024 
A) 19.0 
B) 1.59 × 1024 
C) 8.37 × 1022 
D) 2.64 
E) 1.84 × 1024

Question 10

How many moles of pyridine (C5H5N)are contained in 4.14 g of pyridine?

Accepted Answer

A) 0.0523 
B) 327 
C) 6.88 × 10-24 
D) 2.49 ×1024 
E) 79.1 
A) 0.0523 
B) 327 
C) 6.88 × 10-24 
D) 2.49 ×1024 
E) 79.1

Question 11

How many moles of sodium carbonate contain 1.773 × 1017 carbon atoms?

Accepted Answer

A) 5.890 × 10-7 
B) 2.945 × 10-7 
C) 1.473 × 10-7 
D) 8.836 × 10-7 
E) 9.817 × 10-8 
A) 5.890 × 10-7 
B) 2.945 × 10-7 
C) 1.473 × 10-7 
D) 8.836 × 10-7 
E) 9.817 × 10-8

Question 12

Which hydrocarbon pair below has identical mass percentage of C?

Accepted Answer

A) C3H4 and C3H6 
B) C2H4 and C3H4 
C) C2H4 and C4H2 
D) C2H4 and C3H6 
E) none of the above 
A) C3H4 and C3H6 
B) C2H4 and C3H4 
C) C2H4 and C4H2 
D) C2H4 and C3H6 
E) none of the above

Question 13

Gaseous neon has a density of 0.900 g/L at standard conditions.How many neon atoms are in 1.00 L of neon gas at standard conditions?

Accepted Answer

A) 5.42 × 1023 
B) 1.35 × 1025 
C) 7.41 × 10-26 
D) 2.69 × 1022 
E) 6.02 × 1023 
A) 5.42 × 1023 
B) 1.35 × 1025 
C) 7.41 × 10-26 
D) 2.69 × 1022 
E) 6.02 × 1023

Question 14

The formula of nitrobenzene is C6H5NO2.The molecular weight of this compound is ________ amu.

Accepted Answer

A) 107.11 
B) 43.03 
C) 109.10 
D) 123.11 
E) 3.06 
A) 107.11 
B) 43.03 
C) 109.10 
D) 123.11 
E) 3.06

Question 15

Calculate the percentage by mass of ammonia in cisplatin,PtCl2(NH3)2.

Accepted Answer

A) 5.68 
B) 11.35 
C) 4.67 
D) 12.53 
E) 18.09 
A) 5.68 
B) 11.35 
C) 4.67 
D) 12.53 
E) 18.09

Question 16

When the following equation is balanced,the coefficient of H2 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 17

Which of the following are combination reactions?
1.CH4 (g) + O2 (g) → CO2 (g) + H2O (l) 
2.CaO (s) + CO2 (g) → CaCO3 (s)
3.Mg (s) + O2(g) → MgO (s) 
4.PbCO3 (s) → PbO (s) + CO2 (g)

Accepted Answer

A)  1, 2, and 3 
B)  2 and 3 
C)  1, 2, 3, and 4 
D)  4 only 
E)  2, 3, and 4 
A)  1, 2, and 3 
B)  2 and 3 
C)  1, 2, 3, and 4 
D)  4 only 
E)  2, 3, and 4

Question 18

When the following equation is balanced,the coefficient of water is ________. N2O5 (g)+ H2O (l)→ HNO3 (aq)

Accepted Answer

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

Question 19

Calcium carbide (CaC2)reacts with water to produce acetylene (C2H2): CaC2 (s)+ 2H2O (g)→ Ca(OH)2 (s)+ C2H2 (g)
Production of 6.5 g of C2H2 requires consumption of ________ g of H2O.

Accepted Answer

A) 2.3 
B) 4.5 
C) 9.0 
D) 480 
E) 0.048 
A) 2.3 
B) 4.5 
C) 9.0 
D) 480 
E) 0.048

Question 20

One million argon atoms is ________ mol (rounded to two significant figures)of argon atoms.

Accepted Answer

A) 3.0 
B) 1.7 × 10-18 
C) 6.0 × 1023 
D) 1.0 × 10-6 
E) 1.0 × 10+6 
A) 3.0 
B) 1.7 × 10-18 
C) 6.0 × 1023 
D) 1.0 × 10-6 
E) 1.0 × 10+6

Exam 3: Chemical Reactions and Reaction Stoichiometry

When the following equation is balanced,the coefficient of H2S is ________. FeCl3 (aq)+ H2S (g)→ Fe2S3 (s)+ HCl (aq)

Propane (C3H8)reacts with oxygen in the air to produce carbon dioxide and water.In a particular experiment,38.0 grams of carbon dioxide are produced from the reaction of 22.05 grams of propane with excess oxygen.What is the % yield in this reaction?

Which of the following contains the largest number of atoms in mole?

What is the mass % of oxygen in lead (II)nitrate (Pb(NO3)2)rounded to three significant figures?

Magnesium burns in air with a dazzling brilliance to produce magnesium oxide: 2Mg (s)+ O2(g)→ 2MgO (s) How many moles of O2 are consumed when 3.55 mol of magnesium burns?

There are ________ molecules of methane in 0.123 mol of methane (CH4).

How many grams of hydrogen are in 46 g of CH4O?

A compound was found to contain 90.6% lead (Pb)and 9.4% oxygen.The empirical formula for this compound is ________.

What is the total number of atoms in 0.139 mol of Fe(OH2)63+?

How many moles of pyridine (C5H5N)are contained in 4.14 g of pyridine?

How many moles of sodium carbonate contain 1.773 × 1017 carbon atoms?

Which hydrocarbon pair below has identical mass percentage of C?

Gaseous neon has a density of 0.900 g/L at standard conditions.How many neon atoms are in 1.00 L of neon gas at standard conditions?

The formula of nitrobenzene is C6H5NO2.The molecular weight of this compound is ________ amu.

Calculate the percentage by mass of ammonia in cisplatin,PtCl2(NH3)2.

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

Which of the following are combination reactions? 1.CH4 (g) + O2 (g) → CO2 (g) + H2O (l) 2.CaO (s) + CO2 (g) → CaCO3 (s) 3.Mg (s) + O2(g) → MgO (s) 4.PbCO3 (s) → PbO (s) + CO2 (g)

When the following equation is balanced,the coefficient of water is ________. N2O5 (g)+ H2O (l)→ HNO3 (aq)

Calcium carbide (CaC2)reacts with water to produce acetylene (C2H2): CaC2 (s)+ 2H2O (g)→ Ca(OH)2 (s)+ C2H2 (g) Production of 6.5 g of C2H2 requires consumption of ________ g of H2O.

One million argon atoms is ________ mol (rounded to two significant figures)of argon atoms.

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

When the following equation is balanced,the coefficient of H₂S is ________. FeCl₃ (aq)+ H₂S (g)→ Fe₂S₃(s)+ HCl (aq)

Propane (C₃H₈)reacts with oxygen in the air to produce carbon dioxide and water.In a particular experiment,38.0 grams of carbon dioxide are produced from the reaction of 22.05 grams of propane with excess oxygen.What is the % yield in this reaction?

What is the mass % of oxygen in lead (II)nitrate (Pb(NO₃)₂)rounded to three significant figures?

Magnesium burns in air with a dazzling brilliance to produce magnesium oxide: 2Mg (s)+ O₂(g)→ 2MgO (s) How many moles of O₂are consumed when 3.55 mol of magnesium burns?

There are ________ molecules of methane in 0.123 mol of methane (CH₄).

How many grams of hydrogen are in 46 g of CH₄O?

What is the total number of atoms in 0.139 mol of Fe(OH₂)₆³⁺?

How many moles of pyridine (C₅H₅N)are contained in 4.14 g of pyridine?

How many moles of sodium carbonate contain 1.773 × 10¹⁷carbon atoms?

The formula of nitrobenzene is C₆H₅NO₂.The molecular weight of this compound is ________ amu.

Calculate the percentage by mass of ammonia in cisplatin,PtCl₂(NH₃)₂.

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

Which of the following are combination reactions? 1.CH₄ (g) + O₂ (g) → CO2 (g) + H2O (l) 2.CaO (s) + CO₂ (g) → CaCO₃ (s) 3.Mg (s) + O2(g) → MgO (s) 4.PbCO₃ (s) → PbO (s) + CO₂ (g)

When the following equation is balanced,the coefficient of water is ________. N₂O₅ (g)+ H₂O (l)→ HNO₃ (aq)

Calcium carbide (CaC₂)reacts with water to produce acetylene (C₂H₂): CaC₂(s)+ 2H₂O (g)→ Ca(OH)₂ (s)+ C₂H₂ (g) Production of 6.5 g of C₂H₂ requires consumption of ________ g of H₂O.