Question 1

How many grams of dioxygen are required to completely burn 4.7 g of C2H5OH?

Accepted Answer

A)  11 g 
B)  16 g 
C)  3.3 g 
D)  45 g 
E)  57 g 
A)  11 g 
B)  16 g 
C)  3.3 g 
D)  45 g 
E)  57 g

Question 2

Potassium hydrogen carbonate decomposes according to the reaction below: 2 KHCO3(s)→ K2CO3(s)+ CO2(g)+ H2O(l)
How many moles of potassium carbonate are produced if 421 g of potassium hydrogen carbonate is heated?

Accepted Answer

A)  2.10 mol 
B)  3.05 mol 
C)  17.8 mol 
D)  211 mol 
E)  4.21 mol 
A)  2.10 mol 
B)  3.05 mol 
C)  17.8 mol 
D)  211 mol 
E)  4.21 mol

Question 3

If 5.00 g Br2 and 1.10 g NH3 react according to the equation below,what is the maximum mass of ammonium bromide produced? 3 Br2(   )+ 8 NH3(g)→ 6 NH4Br(s)+ N2(g)

Accepted Answer

A)  3.06 g 
B)  6.13 g 
C)  12.9 g 
D)  4.74 g 
E)  8.43 g 
A)  3.06 g 
B)  6.13 g 
C)  12.9 g 
D)  4.74 g 
E)  8.43 g

Question 4

Chlorine was passed over 1.06 g of heated titanium,and 3.40 g of a chloride-containing compound of titanium was obtained.What is the empirical formula of the obtained compound?

Accepted Answer

A)  TiCl2 
B)  TiCl4 
C)  TiCl 
D)  TiCl3 
E)  Ti2Cl3 
A)  TiCl2 
B)  TiCl4 
C)  TiCl 
D)  TiCl3 
E)  Ti2Cl3

Question 5

What mass of iron can be produced from the reaction of 175 kg Fe2O3 with 385 kg CO? Fe2O3(s)+ 3 CO(g)→ 2 Fe(s)+ 3 CO2(g)

Accepted Answer

A)  2.19 kg 
B)  30.6 kg 
C)  61.2 kg 
D)  122 kg 
E)  512 kg 
A)  2.19 kg 
B)  30.6 kg 
C)  61.2 kg 
D)  122 kg 
E)  512 kg

Question 6

A dilute solution is prepared by transferring 35.00 mL of a 0.6363 M stock solution to a 900.0 mL volumetric flask and diluting to mark.What is the molarity of this dilute solution?

Accepted Answer

A)  0.02474 M 
B)  0.04949 M 
C)  0.1636 M 
D)  0.006186 M 
E)  0.3182 M 
A)  0.02474 M 
B)  0.04949 M 
C)  0.1636 M 
D)  0.006186 M 
E)  0.3182 M

Question 7

Soft drink bottles are made of polyethylene terephthalate (PET),a polymer composed of carbon,hydrogen,and oxygen.If 1.9022 g PET is burned in oxygen it produces 0.6585 g H2O and 4.0216 g CO2.What is the empirical formula of PET?

Accepted Answer

A)  CHO 
B)  CH7O5 
C)  C5H7O 
D)  C8H10O 
E)  C10H8O5 
A)  CHO 
B)  CH7O5 
C)  C5H7O 
D)  C8H10O 
E)  C10H8O5

Question 8

Nitric oxide is made from the oxidation of ammonia.What mass of nitric oxide can be made from the reaction of 8.00 g NH3 with 17.0 g O2? 4 NH3(g)+ 5 O2(g)→ 4 NO(g)+ 6 H2O(g)

Accepted Answer

A)  4.54 g 
B)  12.8 g 
C)  14.1 g 
D)  15.9 g 
E)  25.0 g 
A)  4.54 g 
B)  12.8 g 
C)  14.1 g 
D)  15.9 g 
E)  25.0 g

Question 9

What volume of 1.27 M HCl is required to prepare 197.4 mL of 0.456 M HCl?

Accepted Answer

A)  5.5 × 102 mL 
B)  3.41 × 102 mL 
C)  70.9 mL 
D)  0.0141 mL 
E)  1.14 × 102 mL 
A)  5.5 × 102 mL 
B)  3.41 × 102 mL 
C)  70.9 mL 
D)  0.0141 mL 
E)  1.14 × 102 mL

Question 10

The reaction of 5.07 g N2 with 0.722 g H2 produces 1.27 g NH3.The percent yield of this reaction is ________.

Accepted Answer

Question 11

The complete combustion of 0.31 moles of propane,C3H8,will

Accepted Answer

A)  consume 0.31 mol O2 and produce 0.31 mol CO2. 
B)  consume 0.31 mol O2 and produce 0.62 mol CO2. 
C)  consume 1.6 mol O2 and produce 0.93 mol CO2. 
D)  consume 1.6 mol O2 and produce 4.7 mol CO2. 
E)  consume 1.6 mol O2 and produce 1.2 mol CO2. 
A)  consume 0.31 mol O2 and produce 0.31 mol CO2. 
B)  consume 0.31 mol O2 and produce 0.62 mol CO2. 
C)  consume 1.6 mol O2 and produce 0.93 mol CO2. 
D)  consume 1.6 mol O2 and produce 4.7 mol CO2. 
E)  consume 1.6 mol O2 and produce 1.2 mol CO2.

Question 12

Zn reacts with hydrochloric acid. Zn(s)+ 2 HCl(aq)→ ZnCl2(aq)+ H2(g)
What volume of 3.05 M HCl(aq)will react with 25.0 g Zn(s)?

Accepted Answer

A)  0.251 L 
B)  4.01 L 
C)  0.125 L 
D)  0.0627 L 
E)  2.33 L 
A)  0.251 L 
B)  4.01 L 
C)  0.125 L 
D)  0.0627 L 
E)  2.33 L

Question 13

An impure sample of benzoic acid (C6H5COOH,122.12 g/mol)is titrated with 0.5360 M NaOH.A 1.888-g sample requires 20.50 mL of titrant to reach the endpoint.What is the percent by mass of benzoic acid in the sample? C6H5COOH(aq)+ NaOH(aq)→ NaC6H5COO(aq)+ H2O(l)

Accepted Answer

A)  0.008998 % 
B)  1.099 % 
C)  100.0 % 
D)  8.998 % 
E)  71.06 % 
A)  0.008998 % 
B)  1.099 % 
C)  100.0 % 
D)  8.998 % 
E)  71.06 %

Question 14

Molarity is defined as the _____.

Accepted Answer

A)  number of mole equivalents per liter of solution 
B)  amount of solute per liter of solution 
C)  mass of a constituent divided by the volume of the mixture 
D)  ratio of one substance with the mass of the total mixture 
E)  amount of a constituent divided by the total amount of all constituents in a mixture 
A)  number of mole equivalents per liter of solution 
B)  amount of solute per liter of solution 
C)  mass of a constituent divided by the volume of the mixture 
D)  ratio of one substance with the mass of the total mixture 
E)  amount of a constituent divided by the total amount of all constituents in a mixture

Question 15

In order to dilute 77.1 mL of 0.778 M HCl to 0.100 M,the volume of water that must be added is

Accepted Answer

A)  67.2 mL. 
B)  9.91 mL. 
C)  6 × 102 mL. 
D)  1.01 × 10-3 mL. 
E)  5.23 × 102 mL. 
A)  67.2 mL. 
B)  9.91 mL. 
C)  6 × 102 mL. 
D)  1.01 × 10-3 mL. 
E)  5.23 × 102 mL.

Question 16

An aqueous nitric acid solution has a pH of 2.15.What mass of nitric acid,HNO3,is present in 20.0 L of this solution?

Accepted Answer

A)  0.11 g 
B)  0.022 g 
C)  3.7 g 
D)  6.8 g 
E)  8.9 g 
A)  0.11 g 
B)  0.022 g 
C)  3.7 g 
D)  6.8 g 
E)  8.9 g

Question 17

Polyethylene is a polymer consisting of only carbon and hydrogen.If 2.300 g of the polymer is burned in oxygen it produces 2.955 g of H2O and 7.217 g of CO2.Determine the empirical formula of polyethylene.

Accepted Answer

A)  CH 
B)  CH2 
C)  C2H3 
D)  C5H8 
E)  C7H8 
A)  CH 
B)  CH2 
C)  C2H3 
D)  C5H8 
E)  C7H8

Question 18

A 1.295 g sample of a hydrocarbon is burned in an excess of dioxygen,producing 3.553 g CO2 and water.What mass of hydrogen is contained in the original sample?

Accepted Answer

A)  0.3255 g 
B)  2.258 g 
C)  4.848 g 
D)  1.288 g 
E)  0.6475 g 
A)  0.3255 g 
B)  2.258 g 
C)  4.848 g 
D)  1.288 g 
E)  0.6475 g

Question 19

Consider the fermentation reaction of glucose: C6H12O6 → 2C2H5OH + 2CO2
A 1)00-mol sample of C6H12O6 was placed in a vat with 100 g of yeast.If 38.5 g of C2H5OH was obtained,what was the percent yield of C2H5OH?

Accepted Answer

A)  41.8 % 
B)  20.9 % 
C)  38.5 % 
D)  100 % 
E)  none of these 
A)  41.8 % 
B)  20.9 % 
C)  38.5 % 
D)  100 % 
E)  none of these

Question 20

The reaction of 0.779 g K with O2 forms 1.417 g potassium superoxide,a substance used in self-contained breathing devices.Determine the formula for potassium superoxide.

Accepted Answer

A)  KO2 
B)  KO 
C)  K2O3 
D)  K2O 
E)  KO4 
A)  KO2 
B)  KO 
C)  K2O3 
D)  K2O 
E)  KO4

Exam 5: Stoichiometry: Quantitative Information About Chemical Reactions

How many grams of dioxygen are required to completely burn 4.7 g of C2H5OH?

Potassium hydrogen carbonate decomposes according to the reaction below: 2 KHCO3(s)→ K2CO3(s)+ CO2(g)+ H2O(l) How many moles of potassium carbonate are produced if 421 g of potassium hydrogen carbonate is heated?

If 5.00 g Br2 and 1.10 g NH3 react according to the equation below,what is the maximum mass of ammonium bromide produced? 3 Br2( )+ 8 NH3(g)→ 6 NH4Br(s)+ N2(g)

Chlorine was passed over 1.06 g of heated titanium,and 3.40 g of a chloride-containing compound of titanium was obtained.What is the empirical formula of the obtained compound?

What mass of iron can be produced from the reaction of 175 kg Fe2O3 with 385 kg CO? Fe2O3(s)+ 3 CO(g)→ 2 Fe(s)+ 3 CO2(g)

A dilute solution is prepared by transferring 35.00 mL of a 0.6363 M stock solution to a 900.0 mL volumetric flask and diluting to mark.What is the molarity of this dilute solution?

Soft drink bottles are made of polyethylene terephthalate (PET),a polymer composed of carbon,hydrogen,and oxygen.If 1.9022 g PET is burned in oxygen it produces 0.6585 g H2O and 4.0216 g CO2.What is the empirical formula of PET?

Nitric oxide is made from the oxidation of ammonia.What mass of nitric oxide can be made from the reaction of 8.00 g NH3 with 17.0 g O2? 4 NH3(g)+ 5 O2(g)→ 4 NO(g)+ 6 H2O(g)

What volume of 1.27 M HCl is required to prepare 197.4 mL of 0.456 M HCl?

The reaction of 5.07 g N2 with 0.722 g H2 produces 1.27 g NH3.The percent yield of this reaction is ________.

The complete combustion of 0.31 moles of propane,C3H8,will

Zn reacts with hydrochloric acid. Zn(s)+ 2 HCl(aq)→ ZnCl2(aq)+ H2(g) What volume of 3.05 M HCl(aq)will react with 25.0 g Zn(s)?

An impure sample of benzoic acid (C6H5COOH,122.12 g/mol)is titrated with 0.5360 M NaOH.A 1.888-g sample requires 20.50 mL of titrant to reach the endpoint.What is the percent by mass of benzoic acid in the sample? C6H5COOH(aq)+ NaOH(aq)→ NaC6H5COO(aq)+ H2O(l)

Molarity is defined as the _____.

In order to dilute 77.1 mL of 0.778 M HCl to 0.100 M,the volume of water that must be added is

An aqueous nitric acid solution has a pH of 2.15.What mass of nitric acid,HNO3,is present in 20.0 L of this solution?

Polyethylene is a polymer consisting of only carbon and hydrogen.If 2.300 g of the polymer is burned in oxygen it produces 2.955 g of H2O and 7.217 g of CO2.Determine the empirical formula of polyethylene.

A 1.295 g sample of a hydrocarbon is burned in an excess of dioxygen,producing 3.553 g CO2 and water.What mass of hydrogen is contained in the original sample?

Consider the fermentation reaction of glucose: C6H12O6 → 2C2H5OH + 2CO2 A 1)00-mol sample of C6H12O6 was placed in a vat with 100 g of yeast.If 38.5 g of C2H5OH was obtained,what was the percent yield of C2H5OH?

The reaction of 0.779 g K with O2 forms 1.417 g potassium superoxide,a substance used in self-contained breathing devices.Determine the formula for potassium superoxide.

Basic Concepts of Chemistry

Lets Review: The Tools of Quantitative Chemistry

Atoms, molecules, and Ions

Chemical Reactions

Principles of Chemical Reactivity: Energy and Chemical Reactions

The Structure of Atoms

The Structure of Atoms and Periodic Trends

Bonding and Molecular Structure

Bonding and Molecular Structure Orbital Hybridization and Molecular Orbitals

Gases and Their Properties

Intermolecular Forces and Liquids

The Solid State

Solutions and Their Behavior

Chemical Kinetics: the Rates of Chemical Reactions

Principles of Chemical Reactivity: Equilibria

Principles of Chemical Reactivity: the Chemistry of Acids and Bases

Principles of Chemical Reactivity: Other Aspects of Aqueous Equilibria

Principles of Chemical Reactivity: Entropy and Free Energy

Principles of Chemical Reactivity: Electron Transfer Reactions

Environmental Chemistry: Earths Environment, energy, and Sustainability

The Chemistry of the Main Group Elements

The Chemistry of the Transition Elements

Carbon: Not Just Another Element

Biochemistry

Nuclear Chemistry

Filters

How many grams of dioxygen are required to completely burn 4.7 g of C₂H₅OH?

Potassium hydrogen carbonate decomposes according to the reaction below: 2 KHCO₃(s)→ K₂CO₃(s)+ CO₂(g)+ H₂O(l) How many moles of potassium carbonate are produced if 421 g of potassium hydrogen carbonate is heated?

If 5.00 g Br₂ and 1.10 g NH₃ react according to the equation below,what is the maximum mass of ammonium bromide produced? 3 Br₂( )+ 8 NH₃(g)→ 6 NH₄Br(s)+ N₂(g)

What mass of iron can be produced from the reaction of 175 kg Fe₂O₃ with 385 kg CO? Fe₂O₃(s)+ 3 CO(g)→ 2 Fe(s)+ 3 CO₂(g)

Soft drink bottles are made of polyethylene terephthalate (PET),a polymer composed of carbon,hydrogen,and oxygen.If 1.9022 g PET is burned in oxygen it produces 0.6585 g H₂O and 4.0216 g CO₂.What is the empirical formula of PET?

Nitric oxide is made from the oxidation of ammonia.What mass of nitric oxide can be made from the reaction of 8.00 g NH₃ with 17.0 g O₂? 4 NH₃(g)+ 5 O₂(g)→ 4 NO(g)+ 6 H₂O(g)

The reaction of 5.07 g N₂ with 0.722 g H₂ produces 1.27 g NH₃.The percent yield of this reaction is ________.

The complete combustion of 0.31 moles of propane,C₃H₈,will

Zn reacts with hydrochloric acid. Zn(s)+ 2 HCl(aq)→ ZnCl₂(aq)+ H₂(g) What volume of 3.05 M HCl(aq)will react with 25.0 g Zn(s)?

An impure sample of benzoic acid (C₆H₅COOH,122.12 g/mol)is titrated with 0.5360 M NaOH.A 1.888-g sample requires 20.50 mL of titrant to reach the endpoint.What is the percent by mass of benzoic acid in the sample? C₆H₅COOH(aq)+ NaOH(aq)→ NaC₆H₅COO(aq)+ H₂O(l)

An aqueous nitric acid solution has a pH of 2.15.What mass of nitric acid,HNO₃,is present in 20.0 L of this solution?

Polyethylene is a polymer consisting of only carbon and hydrogen.If 2.300 g of the polymer is burned in oxygen it produces 2.955 g of H₂O and 7.217 g of CO₂.Determine the empirical formula of polyethylene.

A 1.295 g sample of a hydrocarbon is burned in an excess of dioxygen,producing 3.553 g CO₂ and water.What mass of hydrogen is contained in the original sample?

Consider the fermentation reaction of glucose: C₆H₁₂O₆ → 2C₂H₅OH + 2CO₂ A 1)00-mol sample of C₆H₁₂O₆ was placed in a vat with 100 g of yeast.If 38.5 g of C₂H₅OH was obtained,what was the percent yield of C₂H₅OH?

The reaction of 0.779 g K with O₂ forms 1.417 g potassium superoxide,a substance used in self-contained breathing devices.Determine the formula for potassium superoxide.