Question 1

One million argon atoms is mol of argon atoms.

Accepted Answer

A)  3 
B)  1.0 × 10- 6 
C)  1.7 × 10- 18 
D)  1.0 × 10+6 
E)  6.0 × 1023 
A)  3 
B)  1.0 × 10- 6 
C)  1.7 × 10- 18 
D)  1.0 × 10+6 
E)  6.0 × 1023

Question 2

One mole of contains the largest number of atoms.

Accepted Answer

A)  C10H8  
B)  Na3PO4  
C)  Cl2  
D)  S8  
E)  Al2(SO4)3 
A)  C10H8  
B)  Na3PO4  
C)  Cl2  
D)  S8  
E)  Al2(SO4)3

Question 3

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

Accepted Answer

A)  5.56 
B)  2.16 
C)  6.48 
D)  2.78 
E)  3.24 
A)  5.56 
B)  2.16 
C)  6.48 
D)  2.78 
E)  3.24

Question 4

Water can be formed from the stoichiometric reaction of hydrogen with oxygen:
   
A complete reaction of 5.0 g of O2 with excess hydrogen produces g of H2O.

Accepted Answer

Question 5

Sulfur and fluorine react in a combination reaction to produce sulfur hexafluoride:
 
In a particular experiment, the percent yield is 79.0%. This means that a 7.90- g sample of fluorine yields g of SF6 in the presence of excess sulfur.

Accepted Answer

A)  0.110 
B)  24.0 
C)  7.99 
D)  10.1 
E)  30.3 
A)  0.110 
B)  24.0 
C)  7.99 
D)  10.1 
E)  30.3

Question 6

When the following equation is balanced, the coefficient of H2S is .

Accepted Answer

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

Question 7

The mass of a single atom of an element (in amu) is numerically EQUAL to the mass in grams of 1 mole of that element.

Accepted Answer

A) True 
 B)False

Question 8

Lithium and nitrogen react in a combination reaction to produce lithium nitride:
6Li (s) + N2 (g) -2Li3N (s)
How many moles of lithium nitride are produced when 0.450 mol of lithium react in this fashion?

Accepted Answer

A)  1.35 
B)  0.0750 
C)  0.150 
D)  0.225 
E)  0.900 
A)  1.35 
B)  0.0750 
C)  0.150 
D)  0.225 
E)  0.900

Question 9

When the following equation is balanced, the coefficient of water is _.

Accepted Answer

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

Question 10

Silver nitrate and aluminum chloride react with each other by exchanging anions:
 
What mass in grams of AgCl is produced when 4.22 g of AgNO3 react with 7.73 g of AlCl3?

Accepted Answer

A)  11.9 
B)  17.6 
C)  24.9 
D)  3.56 
E)  4.22 
A)  11.9 
B)  17.6 
C)  24.9 
D)  3.56 
E)  4.22

Question 11

When a hydrocarbon burns in air, what component of air reacts?

Accepted Answer

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

Question 12

The formula weight of a substance is .

Accepted Answer

A)  the weight of a sample of the substance 
B)  identical to the molar mass 
C)  the same as the percent by mass weight 
D)  the sum of the atomic weights of each atom in its chemical formula 
E)  determined by combustion analysis 
A)  the weight of a sample of the substance 
B)  identical to the molar mass 
C)  the same as the percent by mass weight 
D)  the sum of the atomic weights of each atom in its chemical formula 
E)  determined by combustion analysis

Question 13

How many molecules of CH4 are in 48.2 g of this compound?

Accepted Answer

A)  5.00 × 1024 
B)  4.00 
C)  3.00 
D)  2.90 × 1025 
E)  1.81 × 1024 
A)  5.00 × 1024 
B)  4.00 
C)  3.00 
D)  2.90 × 1025 
E)  1.81 × 1024

Question 14

When the following equation is balanced, the coefficient of sulfur dioxide is .

Accepted Answer

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

Question 15

Combustion of a 0.9835- g sample of a compound containing only carbon, hydrogen, and oxygen produced 1.900 g of CO2 and 1.070 g of H2O. What is the empirical formula of the compound?

Accepted Answer

A)  C4H10O 
B)  C2H5O2  
C)  C4H10O2  
D)  C2H5O 
E)  C4H11O2 
A)  C4H10O 
B)  C2H5O2  
C)  C4H10O2  
D)  C2H5O 
E)  C4H11O2

Question 16

What is the mass in grams of 9.76 × 1012 atoms of naturally occurring sodium?

Accepted Answer

A)  1.62 × 10- 11 
B)  7.05 × 10- 13 
C)  2.24 × 1014 
D)  22.99 
E)  3.73 × 10- 10 
A)  1.62 × 10- 11 
B)  7.05 × 10- 13 
C)  2.24 × 1014 
D)  22.99 
E)  3.73 × 10- 10

Question 17

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

Accepted Answer

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

Question 18

What is the empirical formula of a compound that contains 27.0% S, 13.4% O, and 59.6% Cl by mass?

Accepted Answer

A)  SOCl2  
B)  S2OCl 
C)  SOCl 
D)  SO2Cl 
E)  ClSO4 
A)  SOCl2  
B)  S2OCl 
C)  SOCl 
D)  SO2Cl 
E)  ClSO4

Question 19

Gaseous argon has a density of 1.40 g/L at standard conditions. How many argon atoms are in 1.00 L of argon gas at standard conditions?

Accepted Answer

A)  4.7 × 1022 
B)  2.1 × 1022 
C)  3.4 × 1025 
D)  1.5 × 1025 
E)  6.02 × 1023 
A)  4.7 × 1022 
B)  2.1 × 1022 
C)  3.4 × 1025 
D)  1.5 × 1025 
E)  6.02 × 1023

Question 20

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

Accepted Answer

A)  74.87 
B)  4.032 
C)  25.13 
D)  92.26 
E)  7.743 
A)  74.87 
B)  4.032 
C)  25.13 
D)  92.26 
E)  7.743

Exam 3: Stoichiometry: Calculations With Chemical Formulas and Equations

One million argon atoms is mol of argon atoms.

One mole of contains the largest number of atoms.

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

Water can be formed from the stoichiometric reaction of hydrogen with oxygen: A complete reaction of 5.0 g of O2 with excess hydrogen produces g of H2O.

Sulfur and fluorine react in a combination reaction to produce sulfur hexafluoride: In a particular experiment, the percent yield is 79.0%. This means that a 7.90- g sample of fluorine yields g of SF6 in the presence of excess sulfur.

When the following equation is balanced, the coefficient of H2S is .

The mass of a single atom of an element (in amu) is numerically EQUAL to the mass in grams of 1 mole of that element.

Lithium and nitrogen react in a combination reaction to produce lithium nitride: 6Li (s) + N2 (g) -2Li3N (s) How many moles of lithium nitride are produced when 0.450 mol of lithium react in this fashion?

When the following equation is balanced, the coefficient of water is _.

Silver nitrate and aluminum chloride react with each other by exchanging anions: What mass in grams of AgCl is produced when 4.22 g of AgNO3 react with 7.73 g of AlCl3?

When a hydrocarbon burns in air, what component of air reacts?

The formula weight of a substance is .

How many molecules of CH4 are in 48.2 g of this compound?

When the following equation is balanced, the coefficient of sulfur dioxide is .

Combustion of a 0.9835- g sample of a compound containing only carbon, hydrogen, and oxygen produced 1.900 g of CO2 and 1.070 g of H2O. What is the empirical formula of the compound?

What is the mass in grams of 9.76 × 1012 atoms of naturally occurring sodium?

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

What is the empirical formula of a compound that contains 27.0% S, 13.4% O, and 59.6% Cl by mass?

Gaseous argon has a density of 1.40 g/L at standard conditions. How many argon atoms are in 1.00 L of argon gas at standard conditions?

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

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

GeF₃H is formed from GeH₄and GeF₄in the combination reaction: If the reaction yield is 92.6%, how many moles of GeF₄are needed to produce 8.00 mol of GeF₃H?

Water can be formed from the stoichiometric reaction of hydrogen with oxygen: A complete reaction of 5.0 g of O₂with excess hydrogen produces g of H₂O.

Sulfur and fluorine react in a combination reaction to produce sulfur hexafluoride: In a particular experiment, the percent yield is 79.0%. This means that a 7.90- g sample of fluorine yields g of SF₆in the presence of excess sulfur.

When the following equation is balanced, the coefficient of H₂S is .

Lithium and nitrogen react in a combination reaction to produce lithium nitride: 6Li (s) + N₂(g) -2Li₃N (s) How many moles of lithium nitride are produced when 0.450 mol of lithium react in this fashion?

Silver nitrate and aluminum chloride react with each other by exchanging anions: What mass in grams of AgCl is produced when 4.22 g of AgNO₃react with 7.73 g of AlCl₃?

How many molecules of CH₄are in 48.2 g of this compound?

Combustion of a 0.9835- g sample of a compound containing only carbon, hydrogen, and oxygen produced 1.900 g of CO₂and 1.070 g of H₂O. What is the empirical formula of the compound?

What is the mass in grams of 9.76 × 10¹²atoms of naturally occurring sodium?

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

The mass % of H in methane (CH₄) is .