Aluminum will react with bromine to form aluminum bromide (used as an acid catalyst in organic synthesis). Al(s) + Br2(l) → Al2Br6(s) [unbalanced] How many moles of Al are needed to form 2.43 mol of Al2Br6?

A) 7.29 mol B) 4.86 mol C) 2.43 mol D) 1.62 mol E) 1.22 mol A) 7.29 mol B) 4.86 mol C) 2.43 mol D) 1.62 mol E) 1.22 mol

Aluminum oxide (used as an adsorbent or a catalyst for organic reactions) forms when aluminum reacts with oxygen. 4Al(s) + 3O2(g) → 2Al2O3(s) A mixture of 82.49 g of aluminum (ℳ= 26.98 g/mol) and 117.65 g of oxygen (ℳ = 32.00 g/mol) is allowed to react. What mass of aluminum oxide (ℳ = 101.96 g/mol) can be formed?

A) 155.8 g B) 200.2 g C) 249.9 g D) 311.7 g E) 374.9 g A) 155.8 g B) 200.2 g C) 249.9 g D) 311.7 g E) 374.9 g

How many molecules of molecular oxygen react with four molecules of NH3 to form four molecules of nitrogen monoxide and six molecules of water?

A) 2 B) 10 C) 3 D) 4 E) 5 A) 2 B) 10 C) 3 D) 4 E) 5

Calculate the molar mass of Ca(BO2)2·6H2O.

A) 273.87 g/mol B) 233.79 g/mol C) 183.79 g/mol D) 174.89 g/mol E) 143.71 g/mol A) 273.87 g/mol B) 233.79 g/mol C) 183.79 g/mol D) 174.89 g/mol E) 143.71 g/mol

Phosphine, an extremely poisonous and highly reactive gas, will react with oxygen to form tetraphosphorus decaoxide and water. PH3(g) + O2(g) → P4O10(s) + H2O(g) [unbalanced] Calculate the mass of P4O10(s) formed when 225 g of PH3 reacts with excess oxygen.

A) 1880 g B) 940. g C) 900. g D) 470 g E) 56.3 g A) 1880 g B) 940. g C) 900. g D) 470 g E) 56.3 g

Alkanes are compounds of carbon and hydrogen with the general formula CnH2n+2. An alkane component of gasoline has a molar mass of between 125 and 130 g/mol. What is the value of n for this alkane?

A) 4 B) 9 C) 10 D) 13 E) 14 A) 4 B) 9 C) 10 D) 13 E) 14

What is the percent yield for the reaction PCl3(g) + Cl2(g) → PCl5(g) If 119.3 g of PCl5 (ℳ = 208.2 g/mol) are formed when 61.3 g of Cl2 (ℳ = 70.91 g/mol) react with excess PCl3?

A) 195% B) 85.0% C) 66.3% D) 51.4% E) 43.7% A) 195% B) 85.0% C) 66.3% D) 51.4% E) 43.7%

Exam 3: Stoichiometry of Formulas and Equations

Aluminum will react with bromine to form aluminum bromide (used as an acid catalyst in organic synthesis). Al(s) + Br₂(l) → Al₂Br₆(s) [unbalanced] How many moles of Al are needed to form 2.43 mol of Al₂Br₆?

(Multiple Choice)

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Question 41

Sulfur dioxide reacts with chlorine to produce thionyl chloride (used as a drying agent for inorganic halides) and dichlorine oxide (used as a bleach for wood, pulp, and textiles). SO₂(g) + 2Cl₂(g) → SOCl₂(g) + Cl₂O(g) If 0.400 mol of Cl₂reacts with excess SO₂, how many moles of Cl₂O are formed?

(Multiple Choice)

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Question 42

Aluminum oxide (used as an adsorbent or a catalyst for organic reactions) forms when aluminum reacts with oxygen. 4Al(s) + 3O₂(g) → 2Al₂O₃(s) A mixture of 82.49 g of aluminum (ℳ= 26.98 g/mol) and 117.65 g of oxygen (ℳ = 32.00 g/mol) is allowed to react. What mass of aluminum oxide (ℳ = 101.96 g/mol) can be formed?

(Multiple Choice)

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Question 43

Calculate the number of moles in 17.8 g of the antacid magnesium hydroxide, Mg(OH)₂.

(Multiple Choice)

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Question 44

Ammonia will react with fluorine to produce dinitrogen tetrafluoride and hydrogen fluoride (used in production of aluminum, in uranium processing, and in frosting of light bulbs). 2NH₃(g) + 5F₂(g) → N₂F₄(g) + 6HF(g) How many moles of NH₃are needed to react completely with 13.6 mol of F₂?

(Multiple Choice)

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Question 45

How many molecules of molecular oxygen react with four molecules of NH₃ to form four molecules of nitrogen monoxide and six molecules of water?

(Multiple Choice)

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Question 46

Terephthalic acid, used in the production of polyester fibers and films, is composed of carbon, hydrogen, and oxygen. When 0.6943 g of terephthalic acid was subjected to combustion analysis it produced 1.471 g CO₂and 0.226 g H₂O. If its molar mass is between 158 and 167 g/mol, what is its molecular formula?

(Multiple Choice)

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Question 47

Analysis of a carbohydrate showed that it consisted of 40.0 % C, 6.71 % H, and 53.3 % O by mass. Its molecular mass was found to be between 140 and 160 amu. What is the molecular formula of this compound?

(Multiple Choice)

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Question 48

Hydroxylamine nitrate contains 29.17 mass % N, 4.20 mass % H, and 66.63 mass O. If its molar mass is between 94 and 98 g/mol, what is its molecular formula?

(Multiple Choice)

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Question 49

Sulfur trioxide can react with atmospheric water vapor to form sulfuric acid that falls as acid rain. Calculate the mass in grams of 3.65 × 10²⁰ molecules of SO₃.

(Multiple Choice)

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Question 50

Determine the percent composition of potassium dichromate, K₂Cr₂O₇.

(Multiple Choice)

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Question 51

What is the mass in grams of 0.250 mol of the common antacid calcium carbonate?

(Multiple Choice)

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Question 52

Magnesium (used in the manufacture of light alloys) reacts with iron(III) chloride to form magnesium chloride and iron. 3Mg(s) + 2FeCl₃(s) → 3MgCl₂(s) + 2Fe(s) A mixture of 41.0 g of magnesium (ℳ = 24.31 g/mol) and 175 g of iron(III) chloride (ℳ= 162.2 g/mol) is allowed to react. Identify the limiting reactant and determine the mass of the excess reactant present in the vessel when the reaction is complete.

(Multiple Choice)

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Question 53

Aluminum reacts with oxygen to produce aluminum oxide which can be used as an adsorbent, desiccant, or catalyst for organic reactions. 4Al(s) + 3O₂(g) → 2Al₂O₃(s) A mixture of 82.49 g of aluminum (ℳ = 26.98 g/mol) and 117.65 g of oxygen (ℳ= 32.00 g/mol) is allowed to react. Identify the limiting reactant and determine the mass of the excess reactant present in the vessel when the reaction is complete.

(Multiple Choice)

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Question 54

Calculate the molar mass of Ca(BO₂)₂·6H₂O.

(Multiple Choice)

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Question 55

Phosphine, an extremely poisonous and highly reactive gas, will react with oxygen to form tetraphosphorus decaoxide and water. PH₃(g) + O₂(g) → P₄O₁₀(s) + H₂O(g) [unbalanced] Calculate the mass of P₄O₁₀(s) formed when 225 g of PH₃reacts with excess oxygen.

(Multiple Choice)

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Question 56

Aluminum sulfate, Al₂(SO₄)₃, is used in tanning leather, purifying water, and manufacture of antiperspirants. Calculate its molar mass.

(Multiple Choice)

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Question 57

How many grams of oxygen are needed to react completely with 200.0 g of ammonia, NH₃? 4NH₃(g) + 5O₂(g) → 4NO(g) + 6H₂O(g)

(Multiple Choice)

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Question 58

Alkanes are compounds of carbon and hydrogen with the general formula C_nH₂n₊₂. An alkane component of gasoline has a molar mass of between 125 and 130 g/mol. What is the value of n for this alkane?

(Multiple Choice)

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Question 59

What is the percent yield for the reaction PCl₃(g) + Cl₂(g) → PCl₅(g) If 119.3 g of PCl₅ (ℳ = 208.2 g/mol) are formed when 61.3 g of Cl₂ (ℳ = 70.91 g/mol) react with excess PCl₃?

(Multiple Choice)

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Question 60

Showing 41 - 60 of 72

Aluminum will react with bromine to form aluminum bromide (used as an acid catalyst in organic synthesis). Al(s) + Br₂(l) → Al₂Br₆(s) [unbalanced] How many moles of Al are needed to form 2.43 mol of Al₂Br₆?

Calculate the number of moles in 17.8 g of the antacid magnesium hydroxide, Mg(OH)₂.

How many molecules of molecular oxygen react with four molecules of NH₃ to form four molecules of nitrogen monoxide and six molecules of water?

Analysis of a carbohydrate showed that it consisted of 40.0 % C, 6.71 % H, and 53.3 % O by mass. Its molecular mass was found to be between 140 and 160 amu. What is the molecular formula of this compound?

Hydroxylamine nitrate contains 29.17 mass % N, 4.20 mass % H, and 66.63 mass O. If its molar mass is between 94 and 98 g/mol, what is its molecular formula?

Sulfur trioxide can react with atmospheric water vapor to form sulfuric acid that falls as acid rain. Calculate the mass in grams of 3.65 × 10²⁰ molecules of SO₃.

Determine the percent composition of potassium dichromate, K₂Cr₂O₇.

What is the mass in grams of 0.250 mol of the common antacid calcium carbonate?

Calculate the molar mass of Ca(BO₂)₂·6H₂O.

Phosphine, an extremely poisonous and highly reactive gas, will react with oxygen to form tetraphosphorus decaoxide and water. PH₃(g) + O₂(g) → P₄O₁₀(s) + H₂O(g) [unbalanced] Calculate the mass of P₄O₁₀(s) formed when 225 g of PH₃reacts with excess oxygen.

Aluminum sulfate, Al₂(SO₄)₃, is used in tanning leather, purifying water, and manufacture of antiperspirants. Calculate its molar mass.

How many grams of oxygen are needed to react completely with 200.0 g of ammonia, NH₃? 4NH₃(g) + 5O₂(g) → 4NO(g) + 6H₂O(g)

Alkanes are compounds of carbon and hydrogen with the general formula C_nH₂n₊₂. An alkane component of gasoline has a molar mass of between 125 and 130 g/mol. What is the value of n for this alkane?

What is the percent yield for the reaction PCl₃(g) + Cl₂(g) → PCl₅(g) If 119.3 g of PCl₅ (ℳ = 208.2 g/mol) are formed when 61.3 g of Cl₂ (ℳ = 70.91 g/mol) react with excess PCl₃?

Keys to the Study of Chemistry: Definitions, Units, and Problem Solving

The Components of Matter

Three Major Classes of Chemical Reactions

Gases and the Kinetic-Molecular Theory

Thermochemistry: Energy Flow and Chemical Change

Quantum Theory and Atomic Structure

Electron Configuration and Chemical Periodicity

Models of Chemical Bonding

The Shapes of Molecules

Theories of Covalent Bonding

Intermolecular Forces: Liquids, Solids, and Phase Changes

The Properties of Mixtures: Solutions and Colloids

Periodic Patterns in the Main-Group Elements

Organic Compounds and the Atomic Properties of Carbon

Kinetics: Rates and Mechanisms of Chemical Reactions

Equilibrium: the Extent of Chemical Reactions

Acid-Base Equilibria

Ionic Equilibria in Aqueous Systems

Thermodynamics: Entropy, Free Energy, and Reaction Direction

Electrochemistry: Chemical Change and Electrical Work

The Elements in Nature and Industry

Transition Elements and Their Coordination Compounds

Nuclear Reactions and Their Applications

Filters

Exam 3: Stoichiometry of Formulas and Equations

Aluminum will react with bromine to form aluminum bromide (used as an acid catalyst in organic synthesis). Al(s) + Br2(l) → Al2Br6(s) [unbalanced] How many moles of Al are needed to form 2.43 mol of Al2Br6?

Sulfur dioxide reacts with chlorine to produce thionyl chloride (used as a drying agent for inorganic halides) and dichlorine oxide (used as a bleach for wood, pulp, and textiles). SO2(g) + 2Cl2(g) → SOCl2(g) + Cl2O(g) If 0.400 mol of Cl2 reacts with excess SO2, how many moles of Cl2O are formed?

Calculate the number of moles in 17.8 g of the antacid magnesium hydroxide, Mg(OH)2.

Ammonia will react with fluorine to produce dinitrogen tetrafluoride and hydrogen fluoride (used in production of aluminum, in uranium processing, and in frosting of light bulbs). 2NH3(g) + 5F2(g) → N2F4(g) + 6HF(g) How many moles of NH3 are needed to react completely with 13.6 mol of F2?

How many molecules of molecular oxygen react with four molecules of NH3 to form four molecules of nitrogen monoxide and six molecules of water?

Analysis of a carbohydrate showed that it consisted of 40.0 % C, 6.71 % H, and 53.3 % O by mass. Its molecular mass was found to be between 140 and 160 amu. What is the molecular formula of this compound?

Hydroxylamine nitrate contains 29.17 mass % N, 4.20 mass % H, and 66.63 mass O. If its molar mass is between 94 and 98 g/mol, what is its molecular formula?

Sulfur trioxide can react with atmospheric water vapor to form sulfuric acid that falls as acid rain. Calculate the mass in grams of 3.65 × 1020 molecules of SO3.

Determine the percent composition of potassium dichromate, K2Cr2O7.

What is the mass in grams of 0.250 mol of the common antacid calcium carbonate?

Calculate the molar mass of Ca(BO2)2·6H2O.

Phosphine, an extremely poisonous and highly reactive gas, will react with oxygen to form tetraphosphorus decaoxide and water. PH3(g) + O2(g) → P4O10(s) + H2O(g) [unbalanced] Calculate the mass of P4O10(s) formed when 225 g of PH3 reacts with excess oxygen.

Aluminum sulfate, Al2(SO4)3, is used in tanning leather, purifying water, and manufacture of antiperspirants. Calculate its molar mass.

How many grams of oxygen are needed to react completely with 200.0 g of ammonia, NH3? 4NH3(g) + 5O2(g) → 4NO(g) + 6H2O(g)

Alkanes are compounds of carbon and hydrogen with the general formula CnH2n+2. An alkane component of gasoline has a molar mass of between 125 and 130 g/mol. What is the value of n for this alkane?

What is the percent yield for the reaction PCl3(g) + Cl2(g) → PCl5(g) If 119.3 g of PCl5 (ℳ = 208.2 g/mol) are formed when 61.3 g of Cl2 (ℳ = 70.91 g/mol) react with excess PCl3?

Keys to the Study of Chemistry: Definitions, Units, and Problem Solving

The Components of Matter

Three Major Classes of Chemical Reactions

Gases and the Kinetic-Molecular Theory

Thermochemistry: Energy Flow and Chemical Change

Quantum Theory and Atomic Structure

Electron Configuration and Chemical Periodicity

Models of Chemical Bonding

The Shapes of Molecules

Theories of Covalent Bonding

Intermolecular Forces: Liquids, Solids, and Phase Changes

The Properties of Mixtures: Solutions and Colloids

Periodic Patterns in the Main-Group Elements

Organic Compounds and the Atomic Properties of Carbon

Kinetics: Rates and Mechanisms of Chemical Reactions

Equilibrium: the Extent of Chemical Reactions

Acid-Base Equilibria

Ionic Equilibria in Aqueous Systems

Thermodynamics: Entropy, Free Energy, and Reaction Direction

Electrochemistry: Chemical Change and Electrical Work

The Elements in Nature and Industry

Transition Elements and Their Coordination Compounds

Nuclear Reactions and Their Applications

Filters

Aluminum will react with bromine to form aluminum bromide (used as an acid catalyst in organic synthesis). Al(s) + Br₂(l) → Al₂Br₆(s) [unbalanced] How many moles of Al are needed to form 2.43 mol of Al₂Br₆?

Calculate the number of moles in 17.8 g of the antacid magnesium hydroxide, Mg(OH)₂.

How many molecules of molecular oxygen react with four molecules of NH₃ to form four molecules of nitrogen monoxide and six molecules of water?

Sulfur trioxide can react with atmospheric water vapor to form sulfuric acid that falls as acid rain. Calculate the mass in grams of 3.65 × 10²⁰ molecules of SO₃.

Determine the percent composition of potassium dichromate, K₂Cr₂O₇.

Calculate the molar mass of Ca(BO₂)₂·6H₂O.

Phosphine, an extremely poisonous and highly reactive gas, will react with oxygen to form tetraphosphorus decaoxide and water. PH₃(g) + O₂(g) → P₄O₁₀(s) + H₂O(g) [unbalanced] Calculate the mass of P₄O₁₀(s) formed when 225 g of PH₃reacts with excess oxygen.

Aluminum sulfate, Al₂(SO₄)₃, is used in tanning leather, purifying water, and manufacture of antiperspirants. Calculate its molar mass.

How many grams of oxygen are needed to react completely with 200.0 g of ammonia, NH₃? 4NH₃(g) + 5O₂(g) → 4NO(g) + 6H₂O(g)

Alkanes are compounds of carbon and hydrogen with the general formula C_nH₂n₊₂. An alkane component of gasoline has a molar mass of between 125 and 130 g/mol. What is the value of n for this alkane?

What is the percent yield for the reaction PCl₃(g) + Cl₂(g) → PCl₅(g) If 119.3 g of PCl₅ (ℳ = 208.2 g/mol) are formed when 61.3 g of Cl₂ (ℳ = 70.91 g/mol) react with excess PCl₃?