Question 1

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

Accepted Answer

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

Question 2

When the following equation is balanced, the coefficient of O2 is _ .

Accepted Answer

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

Question 3

A nitrogen oxide is 63.65% by mass nitrogen. The molecular formula could be _ _.

Accepted Answer

A)  N2O4 
B)  N2O 
C)  NO2 
D)  NO 
E)  either NO2 or N2O4 
A)  N2O4 
B)  N2O 
C)  NO2 
D)  NO 
E)  either NO2 or N2O4

Question 4

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

Accepted Answer

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

Question 5

A great deal of the carbon dioxide produced by the combustion of fossil fuels is absorbed into the oceans.

Accepted Answer

A) True 
 B)False

Question 6

Which one of the following is not true concerning automotive air bags?

Accepted Answer

A)  The gas used for inflating them is oxygen 
B)  A gas is produced when the air bag activates. 
C)  They are loaded with sodium azide initially 
D)  The two products of the decomposition reaction are sodium and nitrogen 
E)  They are inflated as a result of a decomposition reaction 
A)  The gas used for inflating them is oxygen 
B)  A gas is produced when the air bag activates. 
C)  They are loaded with sodium azide initially 
D)  The two products of the decomposition reaction are sodium and nitrogen 
E)  They are inflated as a result of a decomposition reaction

Question 7

A compound that is composed of only carbon and hydrogen contains 85.7% C and 14.3% H by mass. What is the empirical formula of the compound?

Accepted Answer

A)  CH4  
B)  C2H4  
C)  CH2  
D)  C86H14  
E)  C4H8 
A)  CH4  
B)  C2H4  
C)  CH2  
D)  C86H14  
E)  C4H8

Question 8

The combustion of propane (C3H8) produces CO2 and H2O:
 
The reaction of 2.5 mol of O2 will produce mol of H2O.

Accepted Answer

A)  4.0 
B)  3.0 
C)  2.5 
D)  2.0 
E)  1.0 
A)  4.0 
B)  3.0 
C)  2.5 
D)  2.0 
E)  1.0

Question 9

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

Accepted Answer

A)  23.63 
B)  12.53 
C)  25.05 
D)  11.82 
E)  18.09 
A)  23.63 
B)  12.53 
C)  25.05 
D)  11.82 
E)  18.09

Question 10

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

Accepted Answer

A)  0.8452 
B)  1.183 
C)  6.022 × 1023 
D)  3.134 × 1025 
E)  8.648 × 1023 
A)  0.8452 
B)  1.183 
C)  6.022 × 1023 
D)  3.134 × 1025 
E)  8.648 × 1023

Question 11

What is the maximum mass in grams of NH3 that can be produced by the reaction of 1.0 g of N2 with 3.0 g of H2 via the equation below?

Accepted Answer

A)  0.61 
B)  2.0 
C)  17 
D)  1.2 
E)  4.0 
A)  0.61 
B)  2.0 
C)  17 
D)  1.2 
E)  4.0

Question 12

Under appropriate conditions, nitrogen and hydrogen undergo a combination reaction to yield ammonia:
   
A 9.3- g sample of hydrogen requires

Accepted Answer

The answer of Under appropriate conditions, nitrogen and hydrogen undergo...

Question 13

How many atoms of nitrogen are in 10 g of NH4NO3?

Accepted Answer

A)  2 
B)  3.0 × 1023  
C)  1.8 
D)  3.5 
E)  1.5 × 1023 
A)  2 
B)  3.0 × 1023  
C)  1.8 
D)  3.5 
E)  1.5 × 1023

Question 14

What mass in grams of hydrogen is produced by the reaction of 4.73 g of magnesium with 1.83 g of water?

Accepted Answer

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

Question 15

There are _ sulfur atoms in 25 molecules of C4H4S2.

Accepted Answer

A)  3.0 × 1025 
B)  50 
C)  6.02 × 1023 
D)  1.5 × 1025 
E)  4.8 × 1025 
A)  3.0 × 1025 
B)  50 
C)  6.02 × 1023 
D)  1.5 × 1025 
E)  4.8 × 1025

Question 16

Of the reactions below, which one is a decomposition reaction?

Accepted Answer

A)  2CH4  + 4O2  -2CO2  + 4H2O 
B)  2Mg + O2 - 2MgO 
C)  Cd(NO3)2 + Na2S - CdS + 2NaNO3 
D)  2N2 + 3H2 - 2NH3 
E)  NH4Cl - NH3 + HCl 
A)  2CH4  + 4O2  -2CO2  + 4H2O 
B)  2Mg + O2 - 2MgO 
C)  Cd(NO3)2 + Na2S - CdS + 2NaNO3 
D)  2N2 + 3H2 - 2NH3 
E)  NH4Cl - NH3 + HCl

Question 17

A compound contains 40.0% C, 6.71% H, and 53.29% O by mass. The molecular weight of the compound is 60.05 amu. The molecular formula of this compound is _ _.

Accepted Answer

A)  C2H3O4  
B)  CHO2  
C)  C2H4O2  
D)  C2H2O4  
E)  CH2O 
A)  C2H3O4  
B)  CHO2  
C)  C2H4O2  
D)  C2H2O4  
E)  CH2O

Question 18

The combustion of carbon disulfide in the presence of excess oxygen yields carbon dioxide and sulfur dioxide:
   
The combustion of 15 g of CS2 in the presence of excess oxygen yields g of SO2.

Accepted Answer

Question 19

Carbon dioxide called a greenhouse gas because bacterial degradation of fertilizers in a greenhouse environment produce large quantities of carbon dioxide.

Accepted Answer

A) True 
 B)False

Question 20

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%...

Exam 3: Stoichiometry: Calculations With Chemical Formulas and Equations

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

When the following equation is balanced, the coefficient of O2 is _ .

A nitrogen oxide is 63.65% by mass nitrogen. The molecular formula could be _ _.

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

A great deal of the carbon dioxide produced by the combustion of fossil fuels is absorbed into the oceans.

Which one of the following is not true concerning automotive air bags?

A compound that is composed of only carbon and hydrogen contains 85.7% C and 14.3% H by mass. What is the empirical formula of the compound?

The combustion of propane (C3H8) produces CO2 and H2O: The reaction of 2.5 mol of O2 will produce mol of H2O.

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

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

What is the maximum mass in grams of NH3 that can be produced by the reaction of 1.0 g of N2 with 3.0 g of H2 via the equation below?

Under appropriate conditions, nitrogen and hydrogen undergo a combination reaction to yield ammonia: A 9.3- g sample of hydrogen requires

How many atoms of nitrogen are in 10 g of NH4NO3?

What mass in grams of hydrogen is produced by the reaction of 4.73 g of magnesium with 1.83 g of water?

There are _ sulfur atoms in 25 molecules of C4H4S2.

Of the reactions below, which one is a decomposition reaction?

A compound contains 40.0% C, 6.71% H, and 53.29% O by mass. The molecular weight of the compound is 60.05 amu. The molecular formula of this compound is _ _.

The combustion of carbon disulfide in the presence of excess oxygen yields carbon dioxide and sulfur dioxide: The combustion of 15 g of CS2 in the presence of excess oxygen yields g of SO2.

Carbon dioxide called a greenhouse gas because bacterial degradation of fertilizers in a greenhouse environment produce large quantities of carbon dioxide.

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

When the following equation is balanced, the coefficient of O₂is _ .

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

The combustion of propane (C₃H₈) produces CO₂and H₂O: The reaction of 2.5 mol of O₂will produce mol of H₂O.

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

What is the maximum mass in grams of NH₃that can be produced by the reaction of 1.0 g of N₂ with 3.0 g of H₂via the equation below?

How many atoms of nitrogen are in 10 g of NH₄NO₃?

There are _ sulfur atoms in 25 molecules of C₄H₄S₂.

The combustion of carbon disulfide in the presence of excess oxygen yields carbon dioxide and sulfur dioxide: The combustion of 15 g of CS₂in the presence of excess oxygen yields g of SO₂.