Question 1

What is the percent sodium in sodium carbonate?

Accepted Answer

A) 43.4% 
B) 11.3% 
C) 45.3% 
D) 27.7% 
E) 21.7% 
A) 43.4% 
B) 11.3% 
C) 45.3% 
D) 27.7% 
E) 21.7%

Question 2

Balance the following equation: B2O3(s)+ HF(l)→ BF3(g)+ H2O(l)

Accepted Answer

A) B2O3(s)+ 6HF(l)→ 2BF3(g)+ 3H2O(l) 
B) B2O3(s)+ H6F6 (l)→ B2F6(g)+ H6O3(l) 
C) B2O3(s)+ 2HF(l)→ 2BF3(g)+ H2O(l) 
D) B2O3(s)+ 3HF(l)→ 2BF3(g)+ 3H2O(l) 
E) B2O3(s)+ 6HF(l)→ 2BF3(g)+ 6H2O(l) 
A) B2O3(s)+ 6HF(l)→ 2BF3(g)+ 3H2O(l) 
B) B2O3(s)+ H6F6 (l)→ B2F6(g)+ H6O3(l) 
C) B2O3(s)+ 2HF(l)→ 2BF3(g)+ H2O(l) 
D) B2O3(s)+ 3HF(l)→ 2BF3(g)+ 3H2O(l) 
E) B2O3(s)+ 6HF(l)→ 2BF3(g)+ 6H2O(l)

Question 3

Balance the following equation for the combustion of benzene: C6H6(l)+ O2(g)→ H2O(g)+ CO2(g)

Accepted Answer

A) C6H6(l)+ 9O2(g)→ 3H2O(g)+ 6CO2(g) 
B) C6H6(l)+ 9O2(g)→ 6H2O(g)+ 6CO2(g) 
C) 2C6H6(l)+ 15O2(g)→ 6H2O(g)+ 12CO2(g) 
D) C6H6(l)+ 15O2(g)→ 3H2O(g)+ 6CO2(g) 
E) 2C6H6(l)+ 9O2(g)→ 6H2O(g)+ 12CO2(g) 
A) C6H6(l)+ 9O2(g)→ 3H2O(g)+ 6CO2(g) 
B) C6H6(l)+ 9O2(g)→ 6H2O(g)+ 6CO2(g) 
C) 2C6H6(l)+ 15O2(g)→ 6H2O(g)+ 12CO2(g) 
D) C6H6(l)+ 15O2(g)→ 3H2O(g)+ 6CO2(g) 
E) 2C6H6(l)+ 9O2(g)→ 6H2O(g)+ 12CO2(g)

Question 4

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

Accepted Answer

A) 3.28 mol 
B) 2.32 mol 
C) 0.431 mol 
D) 0.305 mol 
E) 0.200 mol 
A) 3.28 mol 
B) 2.32 mol 
C) 0.431 mol 
D) 0.305 mol 
E) 0.200 mol

Question 5

How many grams of lead(II)chloride is produced if 13.87 g lead(II)nitrate combines with excess hydrochloric acid to produce lead(II)chloride and nitric acid?

Accepted Answer

A) 5.82 g 
B) 14.33 g 
C) 0.086 g 
D) 11.64 g 
E) 16.52 g 
A) 5.82 g 
B) 14.33 g 
C) 0.086 g 
D) 11.64 g 
E) 16.52 g

Question 6

What is the theoretical yield of chromium that can be produced by the reaction of 40.0 g of Cr2O3 with 8.00 g of aluminum according to the chemical equation below? 2Al + Cr2O3 → Al2O3 + 2Cr

Accepted Answer

A) 7.7 g 
B) 15.4 g 
C) 27.4 g 
D) 30.8 g 
E) 49.9 g 
A) 7.7 g 
B) 15.4 g 
C) 27.4 g 
D) 30.8 g 
E) 49.9 g

Question 7

How many grams are contained in a 0.893 mol sample of methane,CH4?

Accepted Answer

A) 1.48 × 10-24 g 
B) 5.38 × 1023 g 
C) 8.64 × 1024 g 
D) 14.3 g 
E) 18.0 g 
A) 1.48 × 10-24 g 
B) 5.38 × 1023 g 
C) 8.64 × 1024 g 
D) 14.3 g 
E) 18.0 g

Question 8

The percent yield can be determined by dividing the actual yield by the theoretical yield and multiplying this value by 100%.

Accepted Answer

A) True 
 B)False

Question 9

What is the coefficient preceding O2 when the following combustion reaction of a fatty acid is properly balanced using the smallest set of whole numbers? __ C18H36O2 + __ O2 → __ CO2 + __ H2O

Accepted Answer

A) 1 
B) 8 
C) 9 
D) 26 
E) 27 
A) 1 
B) 8 
C) 9 
D) 26 
E) 27

Question 10

Smooth muscle myosin is a motor protein that plays a crucial role in the contraction of smooth muscle.If this protein has a molar mass of 480,000 grams/mol,what is the mass,in grams,of 27 moles of smooth muscle myosin?

Accepted Answer

A) 1.8 × 104 g 
B) 1.3 × 107 g 
C) 1.8 × 102 g 
D) 2.8 × 1029 g 
E) None of the answers is correct. 
A) 1.8 × 104 g 
B) 1.3 × 107 g 
C) 1.8 × 102 g 
D) 2.8 × 1029 g 
E) None of the answers is correct.

Question 11

Calculate the formula mass of potassium permanganate,KMnO4.

Accepted Answer

A) 149.91 amu 
B) 79.41 amu 
C) 127.41 amu 
D) 158.04 amu 
E) 174.04 amu 
A) 149.91 amu 
B) 79.41 amu 
C) 127.41 amu 
D) 158.04 amu 
E) 174.04 amu

What is the percent sodium in sodium carbonate?

Balance the following equation: B₂O₃(s)+ HF(l)→ BF₃(g)+ H₂O(l)

Balance the following equation for the combustion of benzene: C₆H₆(l)+ O₂(g)→ H₂O(g)+ CO₂(g)

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

How many grams of lead(II)chloride is produced if 13.87 g lead(II)nitrate combines with excess hydrochloric acid to produce lead(II)chloride and nitric acid?

What is the theoretical yield of chromium that can be produced by the reaction of 40.0 g of Cr₂O₃ with 8.00 g of aluminum according to the chemical equation below? 2Al + Cr₂O₃ → Al₂O₃ + 2Cr

How many grams are contained in a 0.893 mol sample of methane,CH₄?

The percent yield can be determined by dividing the actual yield by the theoretical yield and multiplying this value by 100%.

What is the coefficient preceding O₂ when the following combustion reaction of a fatty acid is properly balanced using the smallest set of whole numbers? C₁₈H₃₆O₂ + O₂ → CO₂ + H₂O

Smooth muscle myosin is a motor protein that plays a crucial role in the contraction of smooth muscle.If this protein has a molar mass of 480,000 grams/mol,what is the mass,in grams,of 27 moles of smooth muscle myosin?

Calculate the formula mass of potassium permanganate,KMnO₄.

Chemistry: the Central Science

Atoms Molecules and Ions

Reactions in Aqueous Solutions

Thermochemistry

Quantum Theory and the Electronic Structure of Atoms

Electron Configuration and the Periodic Table

Chemical Bonding I Basic Concepts

Chemical Bonding Ii Molecular Geometry and Bonding Theories

Gases

Intermolecular Forces and the Physical Properties of Liquids and Solids

Modern Materials

Physical Properties of Solutions

Chemical Kinetics

Chemical Equilibrium

Acids and Bases

Acid-Base Equilibria and Solubility Equilibria

Entropy Free Energy and Equilibrium

Electrochemistry

Nuclear Chemistry

Environmental Chemistry

Coordination Chemistry

Metallurgy and the Chemistry of Metals

Nonmetallic Elements and Their Compounds

Organic Chemistry

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Exam 3: Stoichiometry Ratios of Combination

What is the percent sodium in sodium carbonate?

Balance the following equation: B2O3(s)+ HF(l)→ BF3(g)+ H2O(l)

Balance the following equation for the combustion of benzene: C6H6(l)+ O2(g)→ H2O(g)+ CO2(g)

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

How many grams of lead(II)chloride is produced if 13.87 g lead(II)nitrate combines with excess hydrochloric acid to produce lead(II)chloride and nitric acid?

What is the theoretical yield of chromium that can be produced by the reaction of 40.0 g of Cr2O3 with 8.00 g of aluminum according to the chemical equation below? 2Al + Cr2O3 → Al2O3 + 2Cr

How many grams are contained in a 0.893 mol sample of methane,CH4?

The percent yield can be determined by dividing the actual yield by the theoretical yield and multiplying this value by 100%.

What is the coefficient preceding O2 when the following combustion reaction of a fatty acid is properly balanced using the smallest set of whole numbers? __ C18H36O2 + __ O2 → __ CO2 + __ H2O

Smooth muscle myosin is a motor protein that plays a crucial role in the contraction of smooth muscle.If this protein has a molar mass of 480,000 grams/mol,what is the mass,in grams,of 27 moles of smooth muscle myosin?

Calculate the formula mass of potassium permanganate,KMnO4.

Chemistry: the Central Science

Atoms Molecules and Ions

Reactions in Aqueous Solutions

Thermochemistry

Quantum Theory and the Electronic Structure of Atoms

Electron Configuration and the Periodic Table

Chemical Bonding I Basic Concepts

Chemical Bonding Ii Molecular Geometry and Bonding Theories

Gases

Intermolecular Forces and the Physical Properties of Liquids and Solids

Modern Materials

Physical Properties of Solutions

Chemical Kinetics

Chemical Equilibrium

Acids and Bases

Acid-Base Equilibria and Solubility Equilibria

Entropy Free Energy and Equilibrium

Electrochemistry

Nuclear Chemistry

Environmental Chemistry

Coordination Chemistry

Metallurgy and the Chemistry of Metals

Nonmetallic Elements and Their Compounds

Organic Chemistry

Filters

Balance the following equation: B₂O₃(s)+ HF(l)→ BF₃(g)+ H₂O(l)

Balance the following equation for the combustion of benzene: C₆H₆(l)+ O₂(g)→ H₂O(g)+ CO₂(g)

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

What is the theoretical yield of chromium that can be produced by the reaction of 40.0 g of Cr₂O₃ with 8.00 g of aluminum according to the chemical equation below? 2Al + Cr₂O₃ → Al₂O₃ + 2Cr

How many grams are contained in a 0.893 mol sample of methane,CH₄?

What is the coefficient preceding O₂ when the following combustion reaction of a fatty acid is properly balanced using the smallest set of whole numbers? C₁₈H₃₆O₂ + O₂ → CO₂ + H₂O

Calculate the formula mass of potassium permanganate,KMnO₄.