Glucose (C6H12O6) is oxidized by molecular oxygen to carbon dioxide and water.How many O2 molecules are needed for each molecule of glucose that is oxidized?

A) 1 B) 2 C) 6 D) 12 E) 18 A) 1 B) 2 C) 6 D) 12 E) 18

A 2.0 kg bottle of sodium carbonate (Na2CO3, 106.0 g/mol) is available to clean up a 1665 g sulfuric acid spill (H2SO4, 98.08 g/mol).Is this enough sodium carbonate to neutralize the acid according to the following reaction? H2 SO4 (aq) + Na2 CO3 (s) $\rightarrow$ Na2 SO4 (aq) + CO2 (g) +H2 O(l)

A) Yes, there is about 50% more than what is needed. B) Yes, there is exactly enough sodium carbonate, but no excess. C) Yes, but there is only about 10% excess. D) No, there is not enough sodium carbonate, but the amount is only about 10% too small. E) No, there is not nearly enough sodium carbonate. A) Yes, there is about 50% more than what is needed. B) Yes, there is exactly enough sodium carbonate, but no excess. C) Yes, but there is only about 10% excess. D) No, there is not enough sodium carbonate, but the amount is only about 10% too small. E) No, there is not nearly enough sodium carbonate.

Alkanes share a general chemical formula of Cn H2n+2 .What is n of an alkane with a molar mass in the range of 140-145 g/mol?

A) 10 B) 9 C) 8 D) 11 E) 12 A) 10 B) 9 C) 8 D) 11 E) 12

Global carbon emissions in 2010 were estimated to be on the order of 9.0 * 1012 metric tons of carbon 1 metric ton =1000 kg) in the form of CO2.This is equivalent to _______ kg C.

A) about 2.5 * 1015 B) about 7.5 * 1014 C) about 2.0 * 1014 D) about 1.7 * 1013 E) about 1.2 *1015 A) about 2.5 * 1015 B) about 7.5 * 1014 C) about 2.0 * 1014 D) about 1.7 * 1013 E) about 1.2 *1015

Fuming sulfuric acid is obtained by the addition of SO3 to concentrated H2SO4.The fumes result from the reaction of SO3 gas with water vapor.What is the product when one molecule of SO3 reacts with one molecule of water?

A) two molecules of sulfurous acid B) one sulfate ion C) two sulfite ions D) one molecule of sulfuric acid E) two molecules of sulfuric acid A) two molecules of sulfurous acid B) one sulfate ion C) two sulfite ions D) one molecule of sulfuric acid E) two molecules of sulfuric acid

Exam 7: Stoichiometry Mass Relationships and Chemical Reactions

Glucose (C₆H₁₂O₆) is oxidized by molecular oxygen to carbon dioxide and water.How many O₂ molecules are needed for each molecule of glucose that is oxidized?

(Multiple Choice)

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Question 121

In one type of fuel cell, methanol CH₃OH) enters on one side of the unit and air enters on the other side.Both circulate past electrodes and chemically react to produce carbon dioxide and water along with electricity.Which chemical equation best represents the reaction that occurs?

(Multiple Choice)

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Question 122

Hemlock contains a number of toxins, one of which is coniine.In a combustion experiment, 2.0000 g coniine was burned in excess oxygen to give 5.5343 g CO₂ and 2.4080 g H₂O.In a second experiment, it was determined that the compound is composed of only carbon, hydrogen, and nitrogen and its molar mass is less than 200 g/mol.Using the empirical formula of coniine, indicate how many atoms are in one molecule.For example, if the molecular formula were CNH₂, you would respond 4.

(Multiple Choice)

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Question 123

A 2.0 kg bottle of sodium carbonate (Na₂CO₃, 106.0 g/mol) is available to clean up a 1665 g sulfuric acid spill (H₂SO₄, 98.08 g/mol).Is this enough sodium carbonate to neutralize the acid according to the following reaction? H₂ SO₄ (aq) + Na₂ CO₃ (s) $\rightarrow$ Na₂ SO₄ (aq) + CO₂ (g) +H₂ O(l)

(Multiple Choice)

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Question 124

Allicin is a potent antibacterial compound that is produced by an enzyme when garlic is chopped.Allicin contains carbon, hydrogen, oxygen, and sulfur atoms.In combustion analysis, 10.00 mg allicin produced 16.27 mg of CO₂, 5.55 mg of water, and 7.90 mg of SO₂.What is the empirical formula of allicin?

(Multiple Choice)

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Question 125

n-Heptane (C₇H₁₆, 00.20 g/mol) is an undesirable component of gasoline because it burns explosively and contributes to engine "knocking." Write the balanced combustion reaction of C ₇H₁₆.Calculate the number of grams of C₇H₁₆ that react if 225 g CO₂ (44.01 g/mol) are produced.

(Essay)

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Question 126

Write a definition of the phrase "stoichiometry of a chemical reaction."

(Essay)

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Question 127

Chemical analysis of an organic compound found the following composition: 40.0% C, 53.29% O, and 6.71% H.If the molar mass is 90.08 g/mol, how many empirical formula units are there in the molecular formula?

(Multiple Choice)

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Question 128

Eugenol, a component of clove oil, is 73.15% C, 7.36% H, and 19.49% O; its molar mass is 164.19 g/mol.What is its molecular formula?

(Short Answer)

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Question 129

Sulfur dioxide from coal-fired power plants combines with water in the atmosphere to produce acid rain.What is the product when one molecule of SO₂ reacts with one molecule of water?

(Multiple Choice)

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Question 130

Alkanes share a general chemical formula of C_n H₂_n+2 .What is n of an alkane with a molar mass in the range of 140-145 g/mol?

(Multiple Choice)

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Question 131

Global carbon emissions in 2010 were estimated to be on the order of 9.0 * 10¹² metric tons of carbon 1 metric ton =1000 kg) in the form of CO₂.This is equivalent to _______ kg C.

(Multiple Choice)

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Question 132

Copper(II) sulfate (CuSO₄) can be used to control algae growth.Aqueous CuSO₄ solutions that come in contact with the surface of galvanized (zinc-plated) steel pails undergo the following reaction: CuSO₄ (aq) +Zn(s) $\rightarrow$ Cu(s) +ZnSO₄ (aq) How many grams of zinc would react with 454 g (1 lb) of CuSO₄ (159.61 g/mol)?

(Multiple Choice)

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Question 133

The most abundant metal in Earth's crust is aluminum, found mostly in the form of clays.Bauxite ore, impure hydrated aluminum oxide, can be purified and refined to make the metal.After the first purification step, hydrated aluminum oxide (Al₂O₃ .xH₂O) is obtained.When 100.0 g of this solid was heated and the water driven off, 65.36 g of Al₂O₃ remained.How many water molecules (x in the molecular formula) were there in the hydrate?

(Multiple Choice)

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Question 134

When are an empirical formula and a molecular formula the same?

(Multiple Choice)

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Question 135

One mole is defined as _______

(Multiple Choice)

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Question 136

Which statement about a balanced chemical reaction equation is always correct?

(Multiple Choice)

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Question 137

Phthalocyanine is a large molecule used in printing inks and dyes.Elemental analysis showed that it consists of 74.69% C, 3.525% H, and 21.77 % N and has a molar mass of 514.54 g/mol.What is its molecular formula?

(Multiple Choice)

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Question 138

Fuming sulfuric acid is obtained by the addition of SO₃ to concentrated H₂SO₄.The fumes result from the reaction of SO₃ gas with water vapor.What is the product when one molecule of SO₃ reacts with one molecule of water?

(Multiple Choice)

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Question 139

Some indoor air purification systems work by converting some of the oxygen in the air to ozone, which oxidizes mold, mildew spores, and other biological pollutants.One such system supposedly generates 5.0 g O₃ per hour by passing dry air through the purifier at a rate of 5.0 L/min.If 1.0 L of air contains 0.28 g of oxygen, what percent of the O₂ molecules are converted to O₃ molecules?

(Short Answer)

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Question 140

Showing 121 - 140 of 140

Glucose (C₆H₁₂O₆) is oxidized by molecular oxygen to carbon dioxide and water.How many O₂ molecules are needed for each molecule of glucose that is oxidized?

In one type of fuel cell, methanol CH₃OH) enters on one side of the unit and air enters on the other side.Both circulate past electrodes and chemically react to produce carbon dioxide and water along with electricity.Which chemical equation best represents the reaction that occurs?

n-Heptane (C₇H₁₆, 00.20 g/mol) is an undesirable component of gasoline because it burns explosively and contributes to engine "knocking." Write the balanced combustion reaction of C ₇H₁₆.Calculate the number of grams of C₇H₁₆ that react if 225 g CO₂ (44.01 g/mol) are produced.

Write a definition of the phrase "stoichiometry of a chemical reaction."

Chemical analysis of an organic compound found the following composition: 40.0% C, 53.29% O, and 6.71% H.If the molar mass is 90.08 g/mol, how many empirical formula units are there in the molecular formula?

Eugenol, a component of clove oil, is 73.15% C, 7.36% H, and 19.49% O; its molar mass is 164.19 g/mol.What is its molecular formula?

Sulfur dioxide from coal-fired power plants combines with water in the atmosphere to produce acid rain.What is the product when one molecule of SO₂ reacts with one molecule of water?

Alkanes share a general chemical formula of C_n H₂_n+2 .What is n of an alkane with a molar mass in the range of 140-145 g/mol?

Global carbon emissions in 2010 were estimated to be on the order of 9.0 * 10¹² metric tons of carbon 1 metric ton =1000 kg) in the form of CO₂.This is equivalent to _______ kg C.

When are an empirical formula and a molecular formula the same?

One mole is defined as _______

Which statement about a balanced chemical reaction equation is always correct?

Phthalocyanine is a large molecule used in printing inks and dyes.Elemental analysis showed that it consists of 74.69% C, 3.525% H, and 21.77 % N and has a molar mass of 514.54 g/mol.What is its molecular formula?

Fuming sulfuric acid is obtained by the addition of SO₃ to concentrated H₂SO₄.The fumes result from the reaction of SO₃ gas with water vapor.What is the product when one molecule of SO₃ reacts with one molecule of water?

Matter and Energy an Atomic Perspective

Atoms, Ions, and Molecules the Building Blocks of Matter

Atomic Structure Explaining the Properties of Elements

Chemical Bonding Understanding Climate Change

Bonding Theories Explaining Molecular Geometry

Intermolecular Forces Attractions Between Particles

Aqueous Solutions Chemistry of the Hydrosphere

Thermochemistry Energy Changes in Chemical Reactions

Properties of Gases the Air We Breathe

Properties of Solutions Their Concentrations and Colligative Properties

Thermodynamics Why Chemical Reactions Happen

Chemical Kinetics Clearing the Air

Chemical Equilibrium Equal but Opposite Reaction Rates

Acid-Base Equilibria Proton Transfer in Biological Systems

Additional Aqueous Equilibria Chemistry and the Oceans

Electrochemistry the Quest for Clean Energy

The Solid State a Particulate View

Organic Chemistry Fuels, Pharmaceuticals, and Modern Materials

Biochemistry the Compounds of Life

Nuclear Chemistry the Risks and Benefits

The Main Group Elements Life and the Periodic Table

Transition Metals Biological and Medical Applications

Filters

Exam 7: Stoichiometry Mass Relationships and Chemical Reactions

Glucose (C6H12O6) is oxidized by molecular oxygen to carbon dioxide and water.How many O2 molecules are needed for each molecule of glucose that is oxidized?

In one type of fuel cell, methanol CH3OH) enters on one side of the unit and air enters on the other side.Both circulate past electrodes and chemically react to produce carbon dioxide and water along with electricity.Which chemical equation best represents the reaction that occurs?

n-Heptane (C7H16, 00.20 g/mol) is an undesirable component of gasoline because it burns explosively and contributes to engine "knocking." Write the balanced combustion reaction of C 7H16.Calculate the number of grams of C7H16 that react if 225 g CO2 (44.01 g/mol) are produced.

Write a definition of the phrase "stoichiometry of a chemical reaction."

Chemical analysis of an organic compound found the following composition: 40.0% C, 53.29% O, and 6.71% H.If the molar mass is 90.08 g/mol, how many empirical formula units are there in the molecular formula?

Eugenol, a component of clove oil, is 73.15% C, 7.36% H, and 19.49% O; its molar mass is 164.19 g/mol.What is its molecular formula?

Sulfur dioxide from coal-fired power plants combines with water in the atmosphere to produce acid rain.What is the product when one molecule of SO2 reacts with one molecule of water?

Alkanes share a general chemical formula of Cn H2n+2 .What is n of an alkane with a molar mass in the range of 140-145 g/mol?

Global carbon emissions in 2010 were estimated to be on the order of 9.0 * 1012 metric tons of carbon 1 metric ton =1000 kg) in the form of CO2.This is equivalent to _______ kg C.

When are an empirical formula and a molecular formula the same?

One mole is defined as _______

Which statement about a balanced chemical reaction equation is always correct?

Phthalocyanine is a large molecule used in printing inks and dyes.Elemental analysis showed that it consists of 74.69% C, 3.525% H, and 21.77 % N and has a molar mass of 514.54 g/mol.What is its molecular formula?

Fuming sulfuric acid is obtained by the addition of SO3 to concentrated H2SO4.The fumes result from the reaction of SO3 gas with water vapor.What is the product when one molecule of SO3 reacts with one molecule of water?

Matter and Energy an Atomic Perspective

Atoms, Ions, and Molecules the Building Blocks of Matter

Atomic Structure Explaining the Properties of Elements

Chemical Bonding Understanding Climate Change

Bonding Theories Explaining Molecular Geometry

Intermolecular Forces Attractions Between Particles

Aqueous Solutions Chemistry of the Hydrosphere

Thermochemistry Energy Changes in Chemical Reactions

Properties of Gases the Air We Breathe

Properties of Solutions Their Concentrations and Colligative Properties

Thermodynamics Why Chemical Reactions Happen

Chemical Kinetics Clearing the Air

Chemical Equilibrium Equal but Opposite Reaction Rates

Acid-Base Equilibria Proton Transfer in Biological Systems

Additional Aqueous Equilibria Chemistry and the Oceans

Electrochemistry the Quest for Clean Energy

The Solid State a Particulate View

Organic Chemistry Fuels, Pharmaceuticals, and Modern Materials

Biochemistry the Compounds of Life

Nuclear Chemistry the Risks and Benefits

The Main Group Elements Life and the Periodic Table

Transition Metals Biological and Medical Applications

Filters

Glucose (C₆H₁₂O₆) is oxidized by molecular oxygen to carbon dioxide and water.How many O₂ molecules are needed for each molecule of glucose that is oxidized?

In one type of fuel cell, methanol CH₃OH) enters on one side of the unit and air enters on the other side.Both circulate past electrodes and chemically react to produce carbon dioxide and water along with electricity.Which chemical equation best represents the reaction that occurs?

n-Heptane (C₇H₁₆, 00.20 g/mol) is an undesirable component of gasoline because it burns explosively and contributes to engine "knocking." Write the balanced combustion reaction of C ₇H₁₆.Calculate the number of grams of C₇H₁₆ that react if 225 g CO₂ (44.01 g/mol) are produced.

Sulfur dioxide from coal-fired power plants combines with water in the atmosphere to produce acid rain.What is the product when one molecule of SO₂ reacts with one molecule of water?

Alkanes share a general chemical formula of C_n H₂_n+2 .What is n of an alkane with a molar mass in the range of 140-145 g/mol?

Global carbon emissions in 2010 were estimated to be on the order of 9.0 * 10¹² metric tons of carbon 1 metric ton =1000 kg) in the form of CO₂.This is equivalent to _______ kg C.

Fuming sulfuric acid is obtained by the addition of SO₃ to concentrated H₂SO₄.The fumes result from the reaction of SO₃ gas with water vapor.What is the product when one molecule of SO₃ reacts with one molecule of water?