Question 1

What is the mass % of oxygen in methanol?

Accepted Answer

A) 16.0 
B) 12.0 
C) 50.0 
D) 4.00 
E) 32.0 
A) 16.0 
B) 12.0 
C) 50.0 
D) 4.00 
E) 32.0

Question 2

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

Accepted Answer

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

Question 3

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

Accepted Answer

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

Question 4

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

Accepted Answer

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

Question 5

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 6

Write the balanced equation for the reaction that occurs when butane undergoes combustion.What is the coefficient of oxygen in the balanced equation?

Accepted Answer

A) 10 
B) 8 
C) 13 
D) 4 
E) 13/2 
A) 10 
B) 8 
C) 13 
D) 4 
E) 13/2

Question 7

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

Question 8

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

Question 9

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

Accepted Answer

A) 1.424 × 1024 
B) 6.022 × 1023 
C) 7.122 × 1023 
D) 5.088 × 1023 
E) 1.018 × 1024 
A) 1.424 × 1024 
B) 6.022 × 1023 
C) 7.122 × 1023 
D) 5.088 × 1023 
E) 1.018 × 1024

Question 10

If the reaction yield is 88.2%,what mass in grams of hydrogen is produced by the reaction of 7.73 g of magnesium with 1.31 g of water?
Mg (s)+ 2H2O (l)→ Mg(OH)2 (s)+ H2 (g)

Accepted Answer

A) 0.0646 
B) 0.0323 
C) 0.0733 
D) 0.147 
E) 0.641 
A) 0.0646 
B) 0.0323 
C) 0.0733 
D) 0.147 
E) 0.641

Question 11

If 588 grams of FeS2 is allowed to react with 352 grams of O2 according to the following unbalanced equation,how many grams of Fe2O3 are produced?
FeS2 + O2 → Fe2O3 + SO2

Accepted Answer

Question 12

Under appropriate conditions,nitrogen and hydrogen undergo a combination reaction to yield ammonia.A 18.2 g sample of hydrogen requires ________ g of N2 for a complete reaction.

Accepted Answer

Question 13

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) 78.7 
C) 46.6 
D) 49.4 
E) 20.8 
A) 94.5 
B) 78.7 
C) 46.6 
D) 49.4 
E) 20.8

Question 14

What is the formula weight of magnesium fluoride (MgF2)?

Accepted Answer

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

Question 15

Which of the following are combustion reactions?
1. CH4 (g) + O2 (g) → CO2 (g) + H2O (l) 
2. CaO (s) + CO2 (g) → CaCO3 (s)
3. PbCO3 (s) → PbO (s) + CO2 (g)
4. CH3OH (l) + O2 (g) → CO2 (g) + H2O (l)

Accepted Answer

A)  1 and 4 
B)  1, 2, 3, and 4 
C)  1, 3, and 4 
D)  2, 3, and 4 
E)  3 and 4 
A)  1 and 4 
B)  1, 2, 3, and 4 
C)  1, 3, and 4 
D)  2, 3, and 4 
E)  3 and 4

Question 16

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

Question 17

Predict the product in the combination reaction below. Al (s)+ N2 (g)→ ________

Accepted Answer

A) AlN 
B) Al3N 
C) AlN2  
D) Al3N2  
E) AlN3 
A) AlN 
B) Al3N 
C) AlN2  
D) Al3N2  
E) AlN3

Question 18

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 19

A 22.5-g sample of ammonium carbonate contains ________ mol of ammonium ions.

Accepted Answer

A) 0.467 
B) 0.288 
C) 0.234 
D) 2.14 
E) 3.47 
A) 0.467 
B) 0.288 
C) 0.234 
D) 2.14 
E) 3.47

Question 20

The compound responsible for the characteristic smell of garlic is allicin,C6H10OS2.What is the mass (g)of 1.00 mol of allicin?

Accepted Answer

A) 34 
B) 162 
C) 86 
D) 61 
E) 19 
A) 34 
B) 162 
C) 86 
D) 61 
E) 19

Exam 3: Chemical Reactions and Reaction Stoichiometry

What is the mass % of oxygen in methanol?

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

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

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

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

Write the balanced equation for the reaction that occurs when butane undergoes combustion.What is the coefficient of oxygen in the balanced equation?

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

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

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

If the reaction yield is 88.2%,what mass in grams of hydrogen is produced by the reaction of 7.73 g of magnesium with 1.31 g of water? Mg (s)+ 2H2O (l)→ Mg(OH)2 (s)+ H2 (g)

If 588 grams of FeS2 is allowed to react with 352 grams of O2 according to the following unbalanced equation,how many grams of Fe2O3 are produced? FeS2 + O2 → Fe2O3 + SO2

Under appropriate conditions,nitrogen and hydrogen undergo a combination reaction to yield ammonia.A 18.2 g sample of hydrogen requires ________ g of N2 for a complete reaction.

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?

What is the formula weight of magnesium fluoride (MgF2)?

Which of the following are combustion reactions? 1. CH4 (g) + O2 (g) → CO2 (g) + H2O (l) 2. CaO (s) + CO2 (g) → CaCO3 (s) 3. PbCO3 (s) → PbO (s) + CO2 (g) 4. CH3OH (l) + O2 (g) → CO2 (g) + H2O (l)

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

Predict the product in the combination reaction below. Al (s)+ N2 (g)→ ________

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?

A 22.5-g sample of ammonium carbonate contains ________ mol of ammonium ions.

The compound responsible for the characteristic smell of garlic is allicin,C6H10OS2.What is the mass (g)of 1.00 mol of allicin?

Introduction: Matter, energy, and Measurement

Atoms, molecules, and Ions

Reactions in Aqueous Solution

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

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

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

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

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

If the reaction yield is 88.2%,what mass in grams of hydrogen is produced by the reaction of 7.73 g of magnesium with 1.31 g of water? Mg (s)+ 2H₂O (l)→ Mg(OH)₂(s)+ H₂(g)

If 588 grams of FeS₂ is allowed to react with 352 grams of O₂according to the following unbalanced equation,how many grams of Fe₂O₃ are produced? FeS₂+ O₂ → Fe₂O₃ + SO₂

Under appropriate conditions,nitrogen and hydrogen undergo a combination reaction to yield ammonia.A 18.2 g sample of hydrogen requires ________ g of N₂for a complete reaction.

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?

What is the formula weight of magnesium fluoride (MgF₂)?

Which of the following are combustion reactions? 1. CH4 (g) + O₂ (g) → CO₂ (g) + H₂O (l) 2. CaO (s) + CO₂ (g) → CaCO₃ (s) 3. PbCO₃ (s) → PbO (s) + CO₂ (g) 4. CH₃OH (l) + O₂ (g) → CO₂ (g) + H₂O (l)

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

Predict the product in the combination reaction below. Al (s)+ N₂(g)→ ________

The compound responsible for the characteristic smell of garlic is allicin,C₆H₁₀OS₂.What is the mass (g)of 1.00 mol of allicin?