Question 1

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 E

Question 2

When the following equation is balanced, the coefficients are ________. NH3 (g) + O2 (g) → NO2 (g) + H2O (g)

Accepted Answer

A) 1, 1, 1, 1 
B) 4, 7, 4, 6 
C) 2, 3, 2, 3 
D) 1, 3, 1, 2 
E) 4, 3, 4, 3 
A) 1, 1, 1, 1 
B) 4, 7, 4, 6 
C) 2, 3, 2, 3 
D) 1, 3, 1, 2 
E) 4, 3, 4, 3 B

Question 3

A 30.5 gram sample of glucose (C6H12O6)contains ________ mol of glucose.

Accepted Answer

A) 0.424 
B) 0.169 
C) 5.90 
D) 2.36 
E) 0.136 
A) 0.424 
B) 0.169 
C) 5.90 
D) 2.36 
E) 0.136 B

Question 4

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 5

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 6

Lead (II)carbonate decomposes to give lead (II)oxide and carbon dioxide: PbCO3 (s) → PbO (s) + CO2 (g)
How many grams of lead (II)oxide will be produced by the decomposition of 2.50 g of lead (II)carbonate?

Accepted Answer

A) 0.41 
B) 2.50 
C) 0.00936 
D) 2.09 
E) 2.61 
A) 0.41 
B) 2.50 
C) 0.00936 
D) 2.09 
E) 2.61

Question 7

The formula weight of lead nitrate (Pb(NO3)2)is ________ amu.

Accepted Answer

A) 269.2 
B) 285.2 
C) 317.2 
D) 331.2 
E) 538.4 
A) 269.2 
B) 285.2 
C) 317.2 
D) 331.2 
E) 538.4

Question 8

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 9

What mass in grams of hydrogen is produced by the reaction of 4.73 g of magnesium with 1.83 g of water? Mg (s) + 2H2O (l) → Mg(OH)2 (s) + H2 (g)

Accepted Answer

A) 0.102 
B) 0.0162 
C) 0.0485 
D) 0.219 
E) 0.204 
A) 0.102 
B) 0.0162 
C) 0.0485 
D) 0.219 
E) 0.204

Question 10

How many grams of calcium cyanide (Ca(CN)2)are contained in 0.69 mol of calcium cyanide?

Accepted Answer

A) 61 
B) 0.0078 
C) 1.2 × 10-24 
D) 4.2 × 1023 
E) 88 
A) 61 
B) 0.0078 
C) 1.2 × 10-24 
D) 4.2 × 1023 
E) 88

Question 11

How many oxygen atoms are contained in 2.74 g of Al2(SO4)3?

Accepted Answer

A) 12 
B) 6.02 × 1023 
C) 7.22 × 1024 
D) 5.79 × 1022 
E) 8.01 × 10-3 
A) 12 
B) 6.02 × 1023 
C) 7.22 × 1024 
D) 5.79 × 1022 
E) 8.01 × 10-3

Question 12

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

Accepted Answer

A) 3.121 × 10-5 
B) 1.011 × 10-5 
C) 1.517 × 10-5 
D) 9.100 × 10-5 
E) 6.066 × 10-5 
A) 3.121 × 10-5 
B) 1.011 × 10-5 
C) 1.517 × 10-5 
D) 9.100 × 10-5 
E) 6.066 × 10-5

Question 13

Calculate the percentage by mass of hydrogen in PtCl2(NH3)2.

Accepted Answer

A) 1.558 
B) 1.008 
C) 0.672 
D) 0.034 
E) 2.016 
A) 1.558 
B) 1.008 
C) 0.672 
D) 0.034 
E) 2.016

Question 14

Lithium and nitrogen react to produce lithium nitride: 6Li (s)+ N2 (g) → 2Li3N (s)
How many moles of lithium nitride are produced when 0.330 mol of lithium react in this fashion?

Accepted Answer

A) 0.110 
B) 0.660 
C) 0.0550 
D) 0.990 
E) 0.165 
A) 0.110 
B) 0.660 
C) 0.0550 
D) 0.990 
E) 0.165

Question 15

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 16

When the following equation is balanced, the coefficient of H2 is ________. CO (g) + H2 (g) → H2O (g) + CH4 (g)

Accepted Answer

A) 1 
B) 2 
C) 3 
D) 4 
E) 0 
A) 1 
B) 2 
C) 3 
D) 4 
E) 0

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 a hydrocarbon burns in air, a component produced is ________.

Accepted Answer

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

Question 19

When the following equation is balanced, the coefficient of H3PO4 is ________. H3PO4 (aq) + NaOH (aq) → Na3PO4 (aq) + H2O (l)

Accepted Answer

A) 1 
B) 2 
C) 3 
D) 4 
E) 0 
A) 1 
B) 2 
C) 3 
D) 4 
E) 0

Question 20

Calculate the percentage by mass of nitrogen in PtCl2(NH3)2.

Accepted Answer

A) 4.67 
B) 9.34 
C) 9.90 
D) 4.95 
E) 12.67 
A) 4.67 
B) 9.34 
C) 9.90 
D) 4.95 
E) 12.67

Exam 3: Stoichiometry: Calculations With Chemical Formulas and Equations

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

When the following equation is balanced, the coefficients are ________. NH3 (g) + O2 (g) → NO2 (g) + H2O (g)

A 30.5 gram sample of glucose (C6H12O6)contains ________ mol of glucose.

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

The formula weight of LiClO4 is ________ amu.

Lead (II)carbonate decomposes to give lead (II)oxide and carbon dioxide: PbCO3 (s) → PbO (s) + CO2 (g) How many grams of lead (II)oxide will be produced by the decomposition of 2.50 g of lead (II)carbonate?

The formula weight of lead nitrate (Pb(NO3)2)is ________ amu.

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

What mass in grams of hydrogen is produced by the reaction of 4.73 g of magnesium with 1.83 g of water? Mg (s) + 2H2O (l) → Mg(OH)2 (s) + H2 (g)

How many grams of calcium cyanide (Ca(CN)2)are contained in 0.69 mol of calcium cyanide?

How many oxygen atoms are contained in 2.74 g of Al2(SO4)3?

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

Calculate the percentage by mass of hydrogen in PtCl2(NH3)2.

Lithium and nitrogen react to produce lithium nitride: 6Li (s)+ N2 (g) → 2Li3N (s) How many moles of lithium nitride are produced when 0.330 mol of lithium react in this fashion?

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

When the following equation is balanced, the coefficient of H2 is ________. CO (g) + H2 (g) → H2O (g) + CH4 (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 a hydrocarbon burns in air, a component produced is ________.

When the following equation is balanced, the coefficient of H3PO4 is ________. H3PO4 (aq) + NaOH (aq) → Na3PO4 (aq) + H2O (l)

Calculate the percentage by mass of nitrogen in PtCl2(NH3)2.

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

When the following equation is balanced, the coefficients are ________. NH₃ (g) + O₂ (g) → NO₂ (g) + H₂O (g)

A 30.5 gram sample of glucose (C₆H₁₂O₆)contains ________ mol of glucose.

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

The formula weight of LiClO₄ is ________ amu.

Lead (II)carbonate decomposes to give lead (II)oxide and carbon dioxide: PbCO₃ (s) → PbO (s) + CO₂ (g) How many grams of lead (II)oxide will be produced by the decomposition of 2.50 g of lead (II)carbonate?

The formula weight of lead nitrate (Pb(NO₃)₂)is ________ amu.

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

What mass in grams of hydrogen is produced by the reaction of 4.73 g of magnesium with 1.83 g of water? Mg (s) + 2H₂O (l) → Mg(OH)₂ (s) + H₂ (g)

How many grams of calcium cyanide (Ca(CN)₂)are contained in 0.69 mol of calcium cyanide?

How many oxygen atoms are contained in 2.74 g of Al₂(SO₄)₃?

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

Calculate the percentage by mass of hydrogen in PtCl₂(NH₃)₂.

Lithium and nitrogen react to produce lithium nitride: 6Li (s)+ N₂ (g) → 2Li₃N (s) How many moles of lithium nitride are produced when 0.330 mol of lithium react in this fashion?

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

When the following equation is balanced, the coefficient of H₂ is ________. CO (g) + H₂ (g) → H₂O (g) + CH₄ (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 H₃PO₄ is ________. H₃PO₄ (aq) + NaOH (aq) → Na₃PO₄ (aq) + H₂O (l)

Calculate the percentage by mass of nitrogen in PtCl₂(NH₃)₂.