Question 1

The formula weight of aluminum sulfate (Al2(SO4)3) is _ amu.

Accepted Answer

A)  123.04 
B)  342.14 
C)  273.06 
D)  59.04 
E)  150.14 
A)  123.04 
B)  342.14 
C)  273.06 
D)  59.04 
E)  150.14

Question 2

The formula weight of potassium dichromate (K2Cr2O7) is _ amu.

Accepted Answer

A)  242.18 
B)  107.09 
C)  333.08 
D)  255.08 
E)  294.18 
A)  242.18 
B)  107.09 
C)  333.08 
D)  255.08 
E)  294.18

Question 3

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)  C2H6  
B)  C20H60  
C)  CH4  
D)  C7H20  
E)  CH3 
A)  C2H6  
B)  C20H60  
C)  CH4  
D)  C7H20  
E)  CH3

Question 4

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?

Accepted Answer

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

Question 5

The molecular weight is ALWAYS a whole- number multiple of the empirical formula weight.

Accepted Answer

A) True 
 B)False

Question 6

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

Question 7

A sulfur oxide is 50.0% by mass sulfur. This molecular formula could be .

Accepted Answer

A)  S2O4 
B)  SO2 
C)  S2O 
D)  SO 
E)  either SO2 or S2O4 
A)  S2O4 
B)  SO2 
C)  S2O 
D)  SO 
E)  either SO2 or S2O4

Question 8

Write the balanced equation for the reaction that occurs when methanol, CH3OH (l), is burned in air. What is the coefficient of oxygen in the balanced equation?

Accepted Answer

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

Question 9

How many carbon atoms are there in 52.06 g of carbon dioxide?

Accepted Answer

A)  3.134 × 1025 
B)  1.424 × 1024 
C)  7.122 × 1023 
D)  5.206 × 1024 
E)  8.648 × 10- 23 
A)  3.134 × 1025 
B)  1.424 × 1024 
C)  7.122 × 1023 
D)  5.206 × 1024 
E)  8.648 × 10- 23

Question 10

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

Accepted Answer

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

Question 11

Lithium and nitrogen react in a combination reaction to produce lithium nitride:
 
How many moles of lithium are needed to produce 0.60 mol of Li3N when the reaction is carried out in the presence of excess nitrogen?

Accepted Answer

A)  0.20 
B)  3.6 
C)  1.8 
D)  0.40 
E)  0.30 
A)  0.20 
B)  3.6 
C)  1.8 
D)  0.40 
E)  0.30

Question 12

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

Question 13

When the following equation is balanced, the coefficient of HCl is .

Accepted Answer

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

Question 14

The formula weight of magnesium fluoride (MgF2) is _ amu.

Accepted Answer

A)  92.9 
B)  62.3 
C)  86.6 
D)  67.6 
E)  43.3 
A)  92.9 
B)  62.3 
C)  86.6 
D)  67.6 
E)  43.3

The formula weight of aluminum sulfate (Al₂(SO₄)₃) is _ amu.

The formula weight of potassium dichromate (K₂Cr₂O₇) is _ amu.

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?

What is the maximum amount in grams of SO₃that can be produced by the reaction of 1.0 g of S with 1.0 g of O₂via the equation below?

The molecular weight is ALWAYS a whole- number multiple of the empirical formula weight.

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

A sulfur oxide is 50.0% by mass sulfur. This molecular formula could be .

Write the balanced equation for the reaction that occurs when methanol, CH₃OH (l), is burned in air. What is the coefficient of oxygen in the balanced equation?

How many carbon atoms are there in 52.06 g of carbon dioxide?

The mass % of C in methane (CH₄) is .

Lithium and nitrogen react in a combination reaction to produce lithium nitride: How many moles of lithium are needed to produce 0.60 mol of Li₃N when the reaction is carried out in the presence of excess nitrogen?

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?

When the following equation is balanced, the coefficient of HCl is .

The formula weight of magnesium fluoride (MgF₂) is _ amu.

Introduction: Matter and Measurement

Atoms, Molecules, and Ions

Aqueous Reactions and Solution Stoichiometry

Electronic Structure of Atoms

Periodic Properties of the Elements

Basic Concepts of Chemical Bonding

Gases

Intermolecular Forces, Liquids, and Solids

Modern Materials

Properties of Solutions

Chemical Kinetics

Chemical Equilibrium

Acid-Base Equilibria

Additional Aspects of Equilibria

Chemistry of the Environment

Chemical Thermodynamics

Electrochemistry

Nuclear Chemistry

Chemistry of the Nonmetals

Metals and Metallurgy

Chemistry of Coordination Compounds

The Chemistry of Life: Organic and Biological Chemistry

Filters

Exam 3: Stoichiometry: Calculations With Chemical Formulas and Equations

The formula weight of aluminum sulfate (Al2(SO4)3) is _ amu.

The formula weight of potassium dichromate (K2Cr2O7) is _ amu.

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?

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?

The molecular weight is ALWAYS a whole- number multiple of the empirical formula weight.

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

A sulfur oxide is 50.0% by mass sulfur. This molecular formula could be .

Write the balanced equation for the reaction that occurs when methanol, CH3OH (l), is burned in air. What is the coefficient of oxygen in the balanced equation?

How many carbon atoms are there in 52.06 g of carbon dioxide?

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

Lithium and nitrogen react in a combination reaction to produce lithium nitride: How many moles of lithium are needed to produce 0.60 mol of Li3N when the reaction is carried out in the presence of excess nitrogen?

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?

When the following equation is balanced, the coefficient of HCl is .

The formula weight of magnesium fluoride (MgF2) is _ amu.

Introduction: Matter and Measurement

Atoms, Molecules, and Ions

Aqueous Reactions and Solution Stoichiometry

Electronic Structure of Atoms

Periodic Properties of the Elements

Basic Concepts of Chemical Bonding

Gases

Intermolecular Forces, Liquids, and Solids

Modern Materials

Properties of Solutions

Chemical Kinetics

Chemical Equilibrium

Acid-Base Equilibria

Additional Aspects of Equilibria

Chemistry of the Environment

Chemical Thermodynamics

Electrochemistry

Nuclear Chemistry

Chemistry of the Nonmetals

Metals and Metallurgy

Chemistry of Coordination Compounds

The Chemistry of Life: Organic and Biological Chemistry

Filters

The formula weight of aluminum sulfate (Al₂(SO₄)₃) is _ amu.

The formula weight of potassium dichromate (K₂Cr₂O₇) is _ amu.

What is the maximum amount in grams of SO₃that can be produced by the reaction of 1.0 g of S with 1.0 g of O₂via the equation below?

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

Write the balanced equation for the reaction that occurs when methanol, CH₃OH (l), is burned in air. What is the coefficient of oxygen in the balanced equation?

The mass % of C in methane (CH₄) is .

Lithium and nitrogen react in a combination reaction to produce lithium nitride: How many moles of lithium are needed to produce 0.60 mol of Li₃N when the reaction is carried out in the presence of excess nitrogen?

The formula weight of magnesium fluoride (MgF₂) is _ amu.