Question 1

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 2

The molecular weight of 2-propanol (C3H7OH), known as rubbing alcohol, is ________ amu (rounded to one decimal place).

Accepted Answer

A) 59.1 
B) 29.0 
C) 60.1 
D) 12.0 
E) 34.0 
A) 59.1 
B) 29.0 
C) 60.1 
D) 12.0 
E) 34.0

Question 3

How many grams of phenol (C6H5OH)are contained in 5.50 mol of phenol?

Accepted Answer

A) 518 
B) 0.0584 
C) 9.14 × 10-24 
D) 3.31 × 1024 
E) 94.1 
A) 518 
B) 0.0584 
C) 9.14 × 10-24 
D) 3.31 × 1024 
E) 94.1

Question 4

A 3.82-g sample of magnesium nitride is reacted with 7.73 g of water: Mg3N2 + 3H2O → 2NH3 + 3MgO
The yield of MgO is 3.60 g. What is the percent yield in the reaction?

Accepted Answer

A) 94.5 
B) 78.4 
C) 46.6 
D) 49.4 
E) 99.9 
A) 94.5 
B) 78.4 
C) 46.6 
D) 49.4 
E) 99.9

Question 5

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 6

Solid aluminum and gaseous oxygen react in a combination reaction to produce aluminum oxide: 4Al (s) + 3O2 (g) → 2Al2O3 (s)
The maximum amount of Al2O3 that can be produced from 2.5 g of Al and 2.5 g of O2 is ________ g.

Accepted Answer

A) 9.4 
B) 7.4 
C) 4.7 
D) 5.3 
E) 5.0 
A) 9.4 
B) 7.4 
C) 4.7 
D) 5.3 
E) 5.0

Question 7

1 mole of which of the following will have the largest mass?

Accepted Answer

A) rubidium 
B) magnesium 
C) gold 
D) neon 
E) 1 mole of any element will contain the same mass. 
A) rubidium 
B) magnesium 
C) gold 
D) neon 
E) 1 mole of any element will contain the same mass.

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

The total number of atoms in 0.111 mol of Fe(CO)3(PH3)2 is ________.

Accepted Answer

A) 15.0 
B) 1.00 × 1024 
C) 4.46 × 1021 
D) 1.67 
E) 2.76 × 10-24 
A) 15.0 
B) 1.00 × 1024 
C) 4.46 × 1021 
D) 1.67 
E) 2.76 × 10-24

Question 10

The formula weight of calcium nitrate (Ca(NO3)2), rounded to one decimal place, is ________ amu.

Accepted Answer

A) 102.1 
B) 164.0 
C) 204.2 
D) 150.1 
E) 116.1 
A) 102.1 
B) 164.0 
C) 204.2 
D) 150.1 
E) 116.1

Question 11

When the following equation is balanced, the coefficient of C3H8O3 is ________. C3H8O3 (g) + O2 (g) → CO2 (g) + H2O (g)

Accepted Answer

A) 1 
B) 2 
C) 3 
D) 7 
E) 5 
A) 1 
B) 2 
C) 3 
D) 7 
E) 5

Question 12

Automotive air bags inflate when sodium azide decomposes explosively to its constituent elements: 2NaN3 (s) → 2Na (s)+ 3N2 (g)
How many moles of N2 are produced by the decomposition of 1.75 mol of sodium azide?

Accepted Answer

A) 1.17 
B) 5.25 
C) 2.63 
D) 0.583 
E) 0.875 
A) 1.17 
B) 5.25 
C) 2.63 
D) 0.583 
E) 0.875

Question 13

What is the maximum amount in grams of SO3 that can be produced by the reaction of 1.0 g of S with 1.0 g of O2 via the equation below? S (s) + O2 (g) → SO3 (g) (not balanced)

Accepted Answer

A) 0.27 
B) 1.7 
C) 2.5 
D) 3.8 
E) 2.0 
A) 0.27 
B) 1.7 
C) 2.5 
D) 3.8 
E) 2.0

Question 14

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

Accepted Answer

A) 164.7 
B) 128.0 
C) 79.0 
D) 264.1 
E) 116.7 
A) 164.7 
B) 128.0 
C) 79.0 
D) 264.1 
E) 116.7

Question 15

A compound that is composed of carbon, hydrogen, and oxygen contains 70.6% C, 5.9% H, and 23.5% O by mass. The molecular weight of the compound is 136 amu. What is the molecular formula?

Accepted Answer

A) C8H8O2 
B) C8H4O 
C) C4H4O 
D) C9H12O 
E) C5H6O2 
A) C8H8O2 
B) C8H4O 
C) C4H4O 
D) C9H12O 
E) C5H6O2

Question 16

GeF3H is formed from GeH4 and GeF4 in the combination reaction: GeH4 + 3GeF4 → 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 17

A sample of CH2F2 with a mass of 19 g contains ________ atoms of F.

Accepted Answer

A) 2.2 × 1023 
B) 38 
C) 3.3 × 1024 
D) 4.4 ×1023 
E) 9.5 
A) 2.2 × 1023 
B) 38 
C) 3.3 × 1024 
D) 4.4 ×1023 
E) 9.5

Question 18

When the following equation is balanced, the coefficient of nitric acid 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

The formula weight of ammonium sulfate ((NH4)2SO4), rounded to the nearest integer, is ________ amu.

Accepted Answer

A) 100 
B) 118 
C) 116 
D) 132 
E) 264 
A) 100 
B) 118 
C) 116 
D) 132 
E) 264

Question 20

How many sulfur dioxide molecules are there in 1.80 mol of sulfur dioxide?

Accepted Answer

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

Exam 3: Stoichiometry: Calculations With Chemical Formulas and Equations

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

The molecular weight of 2-propanol (C3H7OH), known as rubbing alcohol, is ________ amu (rounded to one decimal place).

How many grams of phenol (C6H5OH)are contained in 5.50 mol of phenol?

A 3.82-g sample of magnesium nitride is reacted with 7.73 g of water: Mg3N2 + 3H2O → 2NH3 + 3MgO The yield of MgO is 3.60 g. What is the percent yield in the reaction?

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

Solid aluminum and gaseous oxygen react in a combination reaction to produce aluminum oxide: 4Al (s) + 3O2 (g) → 2Al2O3 (s) The maximum amount of Al2O3 that can be produced from 2.5 g of Al and 2.5 g of O2 is ________ g.

1 mole of which of the following will have the largest mass?

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

The total number of atoms in 0.111 mol of Fe(CO)3(PH3)2 is ________.

The formula weight of calcium nitrate (Ca(NO3)2), rounded to one decimal place, is ________ amu.

When the following equation is balanced, the coefficient of C3H8O3 is ________. C3H8O3 (g) + O2 (g) → CO2 (g) + H2O (g)

Automotive air bags inflate when sodium azide decomposes explosively to its constituent elements: 2NaN3 (s) → 2Na (s)+ 3N2 (g) How many moles of N2 are produced by the decomposition of 1.75 mol of sodium azide?

What is the maximum amount in grams of SO3 that can be produced by the reaction of 1.0 g of S with 1.0 g of O2 via the equation below? S (s) + O2 (g) → SO3 (g) (not balanced)

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

A compound that is composed of carbon, hydrogen, and oxygen contains 70.6% C, 5.9% H, and 23.5% O by mass. The molecular weight of the compound is 136 amu. What is the molecular formula?

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

A sample of CH2F2 with a mass of 19 g contains ________ atoms of F.

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

The formula weight of ammonium sulfate ((NH4)2SO4), rounded to the nearest integer, is ________ amu.

How many sulfur dioxide molecules are there in 1.80 mol of sulfur dioxide?

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

The molecular weight of 2-propanol (C₃H₇OH), known as rubbing alcohol, is ________ amu (rounded to one decimal place).

How many grams of phenol (C₆H₅OH)are contained in 5.50 mol of phenol?

A 3.82-g sample of magnesium nitride is reacted with 7.73 g of water: Mg₃N₂ + 3H₂O → 2NH₃ + 3MgO The yield of MgO is 3.60 g. What is the percent yield in the reaction?

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

Solid aluminum and gaseous oxygen react in a combination reaction to produce aluminum oxide: 4Al (s) + 3O₂ (g) → 2Al₂O₃ (s) The maximum amount of Al₂O₃ that can be produced from 2.5 g of Al and 2.5 g of O₂ is ________ g.

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

The total number of atoms in 0.111 mol of Fe(CO)₃(PH₃)₂ is ________.

The formula weight of calcium nitrate (Ca(NO₃)₂), rounded to one decimal place, is ________ amu.

When the following equation is balanced, the coefficient of C₃H₈O₃ is ________. C₃H₈O₃ (g) + O₂(g) → CO₂ (g) + H₂O (g)

Automotive air bags inflate when sodium azide decomposes explosively to its constituent elements: 2NaN₃ (s) → 2Na (s)+ 3N₂ (g) How many moles of N₂ are produced by the decomposition of 1.75 mol of sodium azide?

What is the maximum amount in grams of SO₃ that can be produced by the reaction of 1.0 g of S with 1.0 g of O₂ via the equation below? S (s) + O₂ (g) → SO₃ (g) (not balanced)

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

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

A sample of CH₂F₂ with a mass of 19 g contains ________ atoms of F.

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

The formula weight of ammonium sulfate ((NH₄)₂SO₄), rounded to the nearest integer, is ________ amu.