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?

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

When the following equation is balanced,the coefficient of O2 is ________. C2H4O (g)+ O2 (g)→ CO2 (g)+ H2O (g)

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

Calcium oxide reacts with water in a combination reaction to produce calcium hydroxide: CaO (s)+ H2O (l)→ Ca(OH)2 (s) A 3.50 g sample of CaO is reacted with 3.38 g of H2O.How many grams of water remain after completion of reaction?

A) 0.00 B) 0.00694 C) 2.25 D) 1.04 E) 0.125 A) 0.00 B) 0.00694 C) 2.25 D) 1.04 E) 0.125

Magnesium and nitrogen react in a combination reaction to produce magnesium nitride: 3 Mg + N2 → Mg3N2 In a particular experiment,a 8.33-g sample of reacts completely.The mass of Mg consumed is ________ g.

A) 7.23 B) 21.7 C) 28.9 D) 0.92 E) 13.9 A) 7.23 B) 21.7 C) 28.9 D) 0.92 E) 13.9

The mass % of F in the binary compound KrF2 is ________.

A) 18.48 B) 45.38 C) 68.80 D) 81.52 E) 31.20 A) 18.48 B) 45.38 C) 68.80 D) 81.52 E) 31.20

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

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

Under appropriate conditions,nitrogen and hydrogen undergo a combination reaction to yield ammonia: N2 (g)+ 3H2 (g)→ 2NH3 (g) If the reaction yield is 81.4 %,how many moles of N2 are needed to produce 8.50 mol of NH3?

A) 20.9 B) 10.4 C) 5.22 D) 6.92 E) 15.7 A) 20.9 B) 10.4 C) 5.22 D) 6.92 E) 15.7

The combustion of ammonia in the presence of oxygen yields NO2 and H2O: 4 NH3 (g)+ 7 O2 (g)→ 4 NO2 (g)+ 6 H2O (g) The combustion of 43.9 g of ammonia with 258 g of oxygen produces ________ g of NO2.

A) 212 B) 178 C) 119 D) 0.954 E) 43.9 A) 212 B) 178 C) 119 D) 0.954 E) 43.9

Sulfur and oxygen react to produce sulfur trioxide.In a particular experiment,7.9 grams of SO3 are produced by the reaction of 6.0 grams of O2 with 7.0 grams of S.What is the % yield of SO3 in this experiment? S (s)+ O2 (g)→ SO3 (g)(not balanced)

A) 45 B) 53 C) 22.5 D) 79 E) 35 A) 45 B) 53 C) 22.5 D) 79 E) 35

Sulfur and oxygen react in a combination reaction to produce sulfur trioxide,an environmental pollutant: 2S (s)+ 3O2 (g)→ 2SO3 (g) In a particular experiment,the reaction of 1.0 g S with 1.0 g O2 produced 0.80 g of SO3.The % yield in this experiment is ________.

A) 32 B) 80 C) 21 D) 64 E) 47 A) 32 B) 80 C) 21 D) 64 E) 47

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

A) 2.41 × 1012 B) 2.50 × 1011 C) 6.34 × 10-10 D) 1.62 × 10-11 E) 3.82 × 1014 A) 2.41 × 1012 B) 2.50 × 1011 C) 6.34 × 10-10 D) 1.62 × 10-11 E) 3.82 × 1014

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

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

Exam 3: Chemical Reactions and Reaction Stoichiometry

Automotive air bags inflate when sodium azide decomposes explosively to its constituent elements: 2NaN₃ (s)→ 2Na (s)+ 3N₂ (g) How many moles of N₂are produced by the decomposition of 1.75 mol of sodium azide?

(Multiple Choice)

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Question 141

When the following equation is balanced,the coefficient of O₂is ________. C₂H₄O(g)+ O₂(g)→ CO₂(g)+ H₂O (g)

(Multiple Choice)

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Question 142

Calcium oxide reacts with water in a combination reaction to produce calcium hydroxide: CaO (s)+ H₂O (l)→ Ca(OH)₂(s) A 3.50 g sample of CaO is reacted with 3.38 g of H₂O.How many grams of water remain after completion of reaction?

(Multiple Choice)

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Question 143

Magnesium and nitrogen react in a combination reaction to produce magnesium nitride: 3 Mg + N₂ → Mg₃N₂ In a particular experiment,a 8.33-g sample of reacts completely.The mass of Mg consumed is ________ g.

(Multiple Choice)

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Question 144

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

(Multiple Choice)

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Question 145

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

(Multiple Choice)

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Question 146

The combustion of carbon disulfide in the presence of excess oxygen yields carbon dioxide and sulfur dioxide.The combustion of 10 mol of CS₂ in the presence of excess oxygen yields ________ mol of SO₂.

(Short Answer)

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Question 147

The mass % of F in the binary compound KrF₂ is ________.

(Multiple Choice)

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Question 148

A great deal of oxygen is produced during combustion.

(True/False)

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Question 149

Water can be formed from the stoichiometric reaction of hydrogen with oxygen.How many grams of H₂O is generated when 45.3 g of O₂reacts with excess hydrogen?

(Short Answer)

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Question 150

Balance the following reaction and determine the coefficient of nitric acid. N₂O₅ (g)+ H₂O (l)→ HNO₃ (aq)

(Multiple Choice)

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Question 151

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?

(Multiple Choice)

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Question 152

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

(Multiple Choice)

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Question 153

What mass in grams of hydrogen is produced by the reaction of 31.3 g of magnesium with 2.12 g of water? Mg (s)+ 2H₂O (l)→ Mg(OH)₂(s)+ H₂(g)

(Multiple Choice)

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Question 154

Under appropriate conditions,nitrogen and hydrogen undergo a combination reaction to yield ammonia: N₂ (g)+ 3H₂(g)→ 2NH₃(g) If the reaction yield is 81.4 %,how many moles of N₂are needed to produce 8.50 mol of NH₃?

(Multiple Choice)

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Question 155

The combustion of ammonia in the presence of oxygen yields NO₂ and H₂O: 4 NH₃ (g)+ 7 O₂ (g)→ 4 NO₂ (g)+ 6 H₂O (g) The combustion of 43.9 g of ammonia with 258 g of oxygen produces ________ g of NO₂.

(Multiple Choice)

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Question 156

Sulfur and oxygen react to produce sulfur trioxide.In a particular experiment,7.9 grams of SO₃are produced by the reaction of 6.0 grams of O₂ with 7.0 grams of S.What is the % yield of SO₃ in this experiment? S (s)+ O₂(g)→ SO₃ (g)(not balanced)

(Multiple Choice)

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Question 157

Sulfur and oxygen react in a combination reaction to produce sulfur trioxide,an environmental pollutant: 2S (s)+ 3O₂ (g)→ 2SO₃ (g) In a particular experiment,the reaction of 1.0 g S with 1.0 g O₂ produced 0.80 g of SO₃.The % yield in this experiment is ________.

(Multiple Choice)

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Question 158

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

(Multiple Choice)

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Question 159

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

(Multiple Choice)

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Question 160

Showing 141 - 160 of 178

Exam 3: Chemical Reactions and Reaction Stoichiometry

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?

When the following equation is balanced,the coefficient of O2 is ________. C2H4O (g)+ O2 (g)→ CO2 (g)+ H2O (g)

Calcium oxide reacts with water in a combination reaction to produce calcium hydroxide: CaO (s)+ H2O (l)→ Ca(OH)2 (s) A 3.50 g sample of CaO is reacted with 3.38 g of H2O.How many grams of water remain after completion of reaction?

Magnesium and nitrogen react in a combination reaction to produce magnesium nitride: 3 Mg + N2 → Mg3N2 In a particular experiment,a 8.33-g sample of reacts completely.The mass of Mg consumed is ________ g.

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

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

The combustion of carbon disulfide in the presence of excess oxygen yields carbon dioxide and sulfur dioxide.The combustion of 10 mol of CS2 in the presence of excess oxygen yields ________ mol of SO2.

The mass % of F in the binary compound KrF2 is ________.

A great deal of oxygen is produced during combustion.

Water can be formed from the stoichiometric reaction of hydrogen with oxygen.How many grams of H2O is generated when 45.3 g of O2 reacts with excess hydrogen?

Balance the following reaction and determine the coefficient of nitric acid. N2O5 (g)+ H2O (l)→ HNO3 (aq)

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?

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

What mass in grams of hydrogen is produced by the reaction of 31.3 g of magnesium with 2.12 g of water? Mg (s)+ 2H2O (l)→ Mg(OH)2 (s)+ H2 (g)

Under appropriate conditions,nitrogen and hydrogen undergo a combination reaction to yield ammonia: N2 (g)+ 3H2 (g)→ 2NH3 (g) If the reaction yield is 81.4 %,how many moles of N2 are needed to produce 8.50 mol of NH3?

The combustion of ammonia in the presence of oxygen yields NO2 and H2O: 4 NH3 (g)+ 7 O2 (g)→ 4 NO2 (g)+ 6 H2O (g) The combustion of 43.9 g of ammonia with 258 g of oxygen produces ________ g of NO2.

Sulfur and oxygen react to produce sulfur trioxide.In a particular experiment,7.9 grams of SO3 are produced by the reaction of 6.0 grams of O2 with 7.0 grams of S.What is the % yield of SO3 in this experiment? S (s)+ O2 (g)→ SO3 (g)(not balanced)

Sulfur and oxygen react in a combination reaction to produce sulfur trioxide,an environmental pollutant: 2S (s)+ 3O2 (g)→ 2SO3 (g) In a particular experiment,the reaction of 1.0 g S with 1.0 g O2 produced 0.80 g of SO3.The % yield in this experiment is ________.

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

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

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

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Electrochemistry

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Chemistry of the Nonmetals

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Automotive air bags inflate when sodium azide decomposes explosively to its constituent elements: 2NaN₃ (s)→ 2Na (s)+ 3N₂ (g) How many moles of N₂are produced by the decomposition of 1.75 mol of sodium azide?

When the following equation is balanced,the coefficient of O₂is ________. C₂H₄O(g)+ O₂(g)→ CO₂(g)+ H₂O (g)

Calcium oxide reacts with water in a combination reaction to produce calcium hydroxide: CaO (s)+ H₂O (l)→ Ca(OH)₂(s) A 3.50 g sample of CaO is reacted with 3.38 g of H₂O.How many grams of water remain after completion of reaction?

Magnesium and nitrogen react in a combination reaction to produce magnesium nitride: 3 Mg + N₂ → Mg₃N₂ In a particular experiment,a 8.33-g sample of reacts completely.The mass of Mg consumed is ________ g.

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

The combustion of carbon disulfide in the presence of excess oxygen yields carbon dioxide and sulfur dioxide.The combustion of 10 mol of CS₂ in the presence of excess oxygen yields ________ mol of SO₂.

The mass % of F in the binary compound KrF₂ is ________.

Water can be formed from the stoichiometric reaction of hydrogen with oxygen.How many grams of H₂O is generated when 45.3 g of O₂reacts with excess hydrogen?

Balance the following reaction and determine the coefficient of nitric acid. N₂O₅ (g)+ H₂O (l)→ HNO₃ (aq)

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

What mass in grams of hydrogen is produced by the reaction of 31.3 g of magnesium with 2.12 g of water? Mg (s)+ 2H₂O (l)→ Mg(OH)₂(s)+ H₂(g)

Under appropriate conditions,nitrogen and hydrogen undergo a combination reaction to yield ammonia: N₂ (g)+ 3H₂(g)→ 2NH₃(g) If the reaction yield is 81.4 %,how many moles of N₂are needed to produce 8.50 mol of NH₃?

The combustion of ammonia in the presence of oxygen yields NO₂ and H₂O: 4 NH₃ (g)+ 7 O₂ (g)→ 4 NO₂ (g)+ 6 H₂O (g) The combustion of 43.9 g of ammonia with 258 g of oxygen produces ________ g of NO₂.

Sulfur and oxygen react to produce sulfur trioxide.In a particular experiment,7.9 grams of SO₃are produced by the reaction of 6.0 grams of O₂ with 7.0 grams of S.What is the % yield of SO₃ in this experiment? S (s)+ O₂(g)→ SO₃ (g)(not balanced)

Sulfur and oxygen react in a combination reaction to produce sulfur trioxide,an environmental pollutant: 2S (s)+ 3O₂ (g)→ 2SO₃ (g) In a particular experiment,the reaction of 1.0 g S with 1.0 g O₂ produced 0.80 g of SO₃.The % yield in this experiment is ________.

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

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