The molecular formula of aspirin is C9H8O4. How many aspirin molecules are present in one 500-milligram tablet?

A) 2.77 molecules B) 2.77 * 10-3 molecules C) 1.67 * 1024 molecules D) 1.67 * 1021 molecules E) None of these is correct. A) 2.77 molecules B) 2.77 * 10-3 molecules C) 1.67 * 1024 molecules D) 1.67 * 1021 molecules E) None of these is correct.

How many atoms are in 4.39 g of CO2?

A) 1.80 * 1023 atoms B) 6.01 * 1022 atoms C) 1.16 * 1026 atoms D) 6.04 * 1024 atoms E) 1.81 * 1025 atoms A) 1.80 * 1023 atoms B) 6.01 * 1022 atoms C) 1.16 * 1026 atoms D) 6.04 * 1024 atoms E) 1.81 * 1025 atoms

Exam 3: Stoichiometry

A chemistry student determined the empirical formula for titanium sulfide (Ti_xS_y). To do so, she reacted titanium with excess sulfur in a crucible, and recorded the following data: Weight of crucible 11.120 g Weight of titanium 8.820 g Weight of crucible and product 31.700 g What is the empirical formula of titanium sulfide?

(Short Answer)

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Question 81

The molecular formula of aspirin is C₉H₈O₄. How many aspirin molecules are present in one 500-milligram tablet?

(Multiple Choice)

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Question 82

Calculate the molecular mass of ethylene glycol, C₂H₆O₂, a compound frequently used as automobile antifreeze.

(Short Answer)

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Question 83

Calculate the percent composition by mass of carbon in Na₂CO₃.

(Short Answer)

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Question 84

The Hall process for the production of aluminum involves the reaction of aluminum oxide with elemental carbon to give aluminum metal and carbon monoxide. If the yield of this reaction is 82% and aluminum ore is 71% by mass aluminum oxide, what mass of aluminum ore must be mined in order to produce 1.0 * 10³ kg (1 metric ton)of aluminum metal by the Hall process?

(Multiple Choice)

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Question 85

When octane (C₈H₁₈)is burned in a particular internal combustion engine, the yield of products (carbon dioxide and water)is 93%. What mass of carbon dioxide will be produced in this engine when 15.0 g of octane is burned with 15.0 g of oxygen gas?

(Multiple Choice)

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Question 86

A method for producing pure copper metal involves the reaction of copper(I)sulfide with oxygen gas to give copper metal and sulfur dioxide. Suppose the yield of this reaction is 87%. What mass of a copper ore consisting of 46% copper(I)sulfide must be mined in order to produce 1.0 * 10³ kg (1.0 metric ton)of copper metal?

(Multiple Choice)

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Question 87

An atom of bromine has a mass about four times greater than that of an atom of neon. How many grams of neon will contain the same number of atoms as 1,000 g of bromine?

(Multiple Choice)

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Question 88

Determine the number of moles of water produced by the reaction of 155 g of ammonia and 356 g of oxygen. 4NH₃ + 5O₂ $\rarr$ 4NO + 6H₂O

(Short Answer)

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Question 89

How many moles of phosphine (PH₃)are produced for every 4.0 moles of hydrogen that react according to the chemical equation below? 3H₂ + P₂ $\rarr$ 2PH₃

(Short Answer)

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Question 90

Refer to the (unbalanced)equation CS₂ + CaO $\rarr$ CO₂ + CaS. How many grams of CaO are required to react completely with 38 g of CS₂?

(Short Answer)

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Question 91

Calculate the molecular mass, in g/mol, of C₆H₁₂O₆.

(Short Answer)

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Question 92

Balance the following equation using the smallest set of whole numbers, then add together the coefficients. Do not forget to count coefficients of one. The sum of the coefficients is _ CH₄ + _ Cl₂ $\rarr$ _ CCl₄ + _ HCl

(Multiple Choice)

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Question 93

Balance the following equation using the smallest set of whole numbers, then add together the coefficients. Don't forget to count coefficients of one. The sum of the coefficients is _ Cr + _ H₂SO₄ $\rarr$ _ Cr₂(SO₄)₃+ _ H₂

(Multiple Choice)

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Question 94

What is the theoretical yield of aluminum that can be produced by the reaction of 60.0 g of aluminum oxide with 30.0 g of carbon according to the following chemical reaction? Al₂O₃ + 3C $\rarr$ 2Al + 3CO

(Multiple Choice)

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Question 95

A mass spectrometer works by ionizing atoms or molecules, and then accelerating them past oppositely charged plates. The mass is obtained by

(Multiple Choice)

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Question 96

Refer to the (unbalanced)equation CS₂ + CaO $\rarr$ CO₂ + CaS. How many grams of CaS are produced if 53 g of CO₂ are produced?

(Short Answer)

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Question 97

Balance the following chemical equation: C₄H₁₀ + O₂ $\rarr$ CO₂ + H₂O

(Essay)

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Question 98

Calculate the percent composition by mass of sodium in Na₂CO₃.

(Short Answer)

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Question 99

How many atoms are in 4.39 g of CO₂?

(Multiple Choice)

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Question 100

Showing 81 - 100 of 168

The molecular formula of aspirin is C₉H₈O₄. How many aspirin molecules are present in one 500-milligram tablet?

Calculate the molecular mass of ethylene glycol, C₂H₆O₂, a compound frequently used as automobile antifreeze.

Calculate the percent composition by mass of carbon in Na₂CO₃.

When octane (C₈H₁₈)is burned in a particular internal combustion engine, the yield of products (carbon dioxide and water)is 93%. What mass of carbon dioxide will be produced in this engine when 15.0 g of octane is burned with 15.0 g of oxygen gas?

An atom of bromine has a mass about four times greater than that of an atom of neon. How many grams of neon will contain the same number of atoms as 1,000 g of bromine?

Determine the number of moles of water produced by the reaction of 155 g of ammonia and 356 g of oxygen. 4NH₃ + 5O₂ $\rarr$ 4NO + 6H₂O

How many moles of phosphine (PH₃)are produced for every 4.0 moles of hydrogen that react according to the chemical equation below? 3H₂ + P₂ $\rarr$ 2PH₃

Refer to the (unbalanced)equation CS₂ + CaO $\rarr$ CO₂ + CaS. How many grams of CaO are required to react completely with 38 g of CS₂?

Calculate the molecular mass, in g/mol, of C₆H₁₂O₆.

Balance the following equation using the smallest set of whole numbers, then add together the coefficients. Do not forget to count coefficients of one. The sum of the coefficients is _ CH₄ + _ Cl₂ $\rarr$ _ CCl₄ + _ HCl

Balance the following equation using the smallest set of whole numbers, then add together the coefficients. Don't forget to count coefficients of one. The sum of the coefficients is _ Cr + _ H₂SO₄ $\rarr$ _ Cr₂(SO₄)₃+ _ H₂

What is the theoretical yield of aluminum that can be produced by the reaction of 60.0 g of aluminum oxide with 30.0 g of carbon according to the following chemical reaction? Al₂O₃ + 3C $\rarr$ 2Al + 3CO

A mass spectrometer works by ionizing atoms or molecules, and then accelerating them past oppositely charged plates. The mass is obtained by

Refer to the (unbalanced)equation CS₂ + CaO $\rarr$ CO₂ + CaS. How many grams of CaS are produced if 53 g of CO₂ are produced?

Balance the following chemical equation: C₄H₁₀ + O₂ $\rarr$ CO₂ + H₂O

Calculate the percent composition by mass of sodium in Na₂CO₃.

How many atoms are in 4.39 g of CO₂?

Introduction

Atoms, Molecules, and Ions

Reactions in Aqueous Solution

Gases

Energy Relationships in Chemical Reactions

The Electronic Structure of Atoms

The Periodic Table

Chemical Bonding I: the Covalent Bond

Chemical Bonding Ii: Molecular Geometry and Hybridization of Atomic Orbitals

Introduction to Organic Chemistry

Intermolecular Forces and Liquids and Solids

Physical Properties of Solutions

Chemical Kinetics

Chemical Equilibrium

Acids and Bases

Acid-Base Equilibria and Solubility Equilibria

Thermodynamics

Redox Reactions and Electrochemistry

The Chemistry of Coordination Compounds

Nuclear Chemistry

Organic Polymerssynthetic and Natural

Filters

Exam 3: Stoichiometry

The molecular formula of aspirin is C9H8O4. How many aspirin molecules are present in one 500-milligram tablet?

Calculate the molecular mass of ethylene glycol, C2H6O2, a compound frequently used as automobile antifreeze.

Calculate the percent composition by mass of carbon in Na2CO3.

When octane (C8H18)is burned in a particular internal combustion engine, the yield of products (carbon dioxide and water)is 93%. What mass of carbon dioxide will be produced in this engine when 15.0 g of octane is burned with 15.0 g of oxygen gas?

An atom of bromine has a mass about four times greater than that of an atom of neon. How many grams of neon will contain the same number of atoms as 1,000 g of bromine?

Determine the number of moles of water produced by the reaction of 155 g of ammonia and 356 g of oxygen. 4NH3 + 5O2 →\rarr→ 4NO + 6H2O

How many moles of phosphine (PH3 )are produced for every 4.0 moles of hydrogen that react according to the chemical equation below? 3H2 + P2 →\rarr→ 2PH3

Refer to the (unbalanced)equation CS2 + CaO →\rarr→ CO2 + CaS. How many grams of CaO are required to react completely with 38 g of CS2?

Calculate the molecular mass, in g/mol, of C6H12O6.

Balance the following equation using the smallest set of whole numbers, then add together the coefficients. Do not forget to count coefficients of one. The sum of the coefficients is ___ CH4 + ___ Cl2 →\rarr→ ___ CCl4 + ___ HCl

Balance the following equation using the smallest set of whole numbers, then add together the coefficients. Don't forget to count coefficients of one. The sum of the coefficients is ___ Cr + ___ H2SO4 →\rarr→ ___ Cr2(SO4)3 + ___ H2

What is the theoretical yield of aluminum that can be produced by the reaction of 60.0 g of aluminum oxide with 30.0 g of carbon according to the following chemical reaction? Al2O3 + 3C →\rarr→ 2Al + 3CO

A mass spectrometer works by ionizing atoms or molecules, and then accelerating them past oppositely charged plates. The mass is obtained by

Refer to the (unbalanced)equation CS2 + CaO →\rarr→ CO2 + CaS. How many grams of CaS are produced if 53 g of CO2 are produced?

Balance the following chemical equation: C4H10 + O2 →\rarr→ CO2 + H2O

Calculate the percent composition by mass of sodium in Na2CO3.

How many atoms are in 4.39 g of CO2?

Introduction

Atoms, Molecules, and Ions

Reactions in Aqueous Solution

Gases

Energy Relationships in Chemical Reactions

The Electronic Structure of Atoms

The Periodic Table

Chemical Bonding I: the Covalent Bond

Chemical Bonding Ii: Molecular Geometry and Hybridization of Atomic Orbitals

Introduction to Organic Chemistry

Intermolecular Forces and Liquids and Solids

Physical Properties of Solutions

Chemical Kinetics

Chemical Equilibrium

Acids and Bases

Acid-Base Equilibria and Solubility Equilibria

Thermodynamics

Redox Reactions and Electrochemistry

The Chemistry of Coordination Compounds

Nuclear Chemistry

Organic Polymerssynthetic and Natural

Filters

The molecular formula of aspirin is C₉H₈O₄. How many aspirin molecules are present in one 500-milligram tablet?

Calculate the molecular mass of ethylene glycol, C₂H₆O₂, a compound frequently used as automobile antifreeze.

Calculate the percent composition by mass of carbon in Na₂CO₃.

When octane (C₈H₁₈)is burned in a particular internal combustion engine, the yield of products (carbon dioxide and water)is 93%. What mass of carbon dioxide will be produced in this engine when 15.0 g of octane is burned with 15.0 g of oxygen gas?

Determine the number of moles of water produced by the reaction of 155 g of ammonia and 356 g of oxygen. 4NH₃ + 5O₂ $\rarr$ 4NO + 6H₂O

How many moles of phosphine (PH₃)are produced for every 4.0 moles of hydrogen that react according to the chemical equation below? 3H₂ + P₂ $\rarr$ 2PH₃

Refer to the (unbalanced)equation CS₂ + CaO $\rarr$ CO₂ + CaS. How many grams of CaO are required to react completely with 38 g of CS₂?

Calculate the molecular mass, in g/mol, of C₆H₁₂O₆.

Balance the following equation using the smallest set of whole numbers, then add together the coefficients. Do not forget to count coefficients of one. The sum of the coefficients is _ CH₄ + _ Cl₂ $\rarr$ _ CCl₄ + _ HCl

Balance the following equation using the smallest set of whole numbers, then add together the coefficients. Don't forget to count coefficients of one. The sum of the coefficients is _ Cr + _ H₂SO₄ $\rarr$ _ Cr₂(SO₄)₃+ _ H₂

What is the theoretical yield of aluminum that can be produced by the reaction of 60.0 g of aluminum oxide with 30.0 g of carbon according to the following chemical reaction? Al₂O₃ + 3C $\rarr$ 2Al + 3CO

Refer to the (unbalanced)equation CS₂ + CaO $\rarr$ CO₂ + CaS. How many grams of CaS are produced if 53 g of CO₂ are produced?

Balance the following chemical equation: C₄H₁₀ + O₂ $\rarr$ CO₂ + H₂O

Calculate the percent composition by mass of sodium in Na₂CO₃.

How many atoms are in 4.39 g of CO₂?