Question 1

50.0 g of Cl2 contains ________ mol Cl2.

Accepted Answer

A) 50.0 
B) 1775 
C) 0.705 
D) 1.41 
E) 4.24 × 1023 
A) 50.0 
B) 1775 
C) 0.705 
D) 1.41 
E) 4.24 × 1023 C

Question 2

How many molecules are present in 3.25 mol of C2H6O?

Accepted Answer

A) 3.25 molecules 
B) 46.0 molecules 
C) 1.85 × 1023 molecules 
D) 6.02 × 1023 molecules 
E) 1.96 × 1024 molecules 
A) 3.25 molecules 
B) 46.0 molecules 
C) 1.85 × 1023 molecules 
D) 6.02 × 1023 molecules 
E) 1.96 × 1024 molecules E

Question 3

A solution containing 145.0 g AgNO3 is mixed with a CaCl2 solution and 98.4 of AgCl is recovered.Calculate the % yield of the reaction.

Accepted Answer

A) 40.16% 
B) 61.11% 
C) 61.99% 
D) 80.44% 
E) 161.3% 
A) 40.16% 
B) 61.11% 
C) 61.99% 
D) 80.44% 
E) 161.3% D

Question 4

The reaction N2 + 3 H2 → 2 NH3 is used to produce ammonia.When 450.g of hydrogen was reacted with nitrogen,1575 g of ammonia were produced.What is the percent yield of this reaction?

Accepted Answer

A) 62.1% 
B) 41.5% 
C) 30.8% 
D) 20.7% 
E) More information is needed to solve this problem. 
A) 62.1% 
B) 41.5% 
C) 30.8% 
D) 20.7% 
E) More information is needed to solve this problem.

Question 5

The combustion of propane gas is used to fuel barbeque grills.If 4.65 moles of propane,C3H8,are burned in a grilling session,how many moles of carbon dioxide gas are formed?
C3H8(g)+ 5 O2(g)→ 3 CO2(g)+ 4 H2O(l)

Accepted Answer

A) 1.55 mol 
B) 14.0 mol 
C) 18.6 mol 
D) 1.16 mol 
E) 3.49 mol 
A) 1.55 mol 
B) 14.0 mol 
C) 18.6 mol 
D) 1.16 mol 
E) 3.49 mol

Question 6

How many molecules are present in 4.25 mol of CCl4?

Accepted Answer

A) 9.26 × 1024 molecules 
B) 2.56 × 1024 molecules 
C) 653.69 molecules 
D) 153.81 molecules 
E) 3.69 × 10-23 molecules 
A) 9.26 × 1024 molecules 
B) 2.56 × 1024 molecules 
C) 653.69 molecules 
D) 153.81 molecules 
E) 3.69 × 10-23 molecules

Question 7

Determine the number of moles of water produced when one mole of NH3 reacts according to the balanced reaction shown.
4 NH3 + 5 O2 → 4 NO + 6 H2O

Accepted Answer

A) 1.00 
B) 1.25 
C) 1.50 
D) 0.67 
E) 1.33 
A) 1.00 
B) 1.25 
C) 1.50 
D) 0.67 
E) 1.33

Question 8

The percentage yield of a reaction can best be described as the ________ times 100%.

Accepted Answer

A) amount of product you could make if the reaction went to completion 
B) total amount of materials involved in a reaction 
C) amount of desired product divided by the amount of unwanted product 
D) amount of product obtained divided by the maximum possible amount of product 
E) amount of reactants left over divided by the original amounts 
A) amount of product you could make if the reaction went to completion 
B) total amount of materials involved in a reaction 
C) amount of desired product divided by the amount of unwanted product 
D) amount of product obtained divided by the maximum possible amount of product 
E) amount of reactants left over divided by the original amounts

Question 9

The fuel for your car is a mixture of octane and several other hydrocarbons.What mass of CO2 will be produced when 125 g of C8H18 react completely in the following equation?
2 C8H18 + 25 O2 → 16 CO2 + 18 H2O

Accepted Answer

A) 6.03 g 
B) 386 g 
C) 259 g 
D) 40.5 g 
E) 0.199 g 
A) 6.03 g 
B) 386 g 
C) 259 g 
D) 40.5 g 
E) 0.199 g

Question 10

In the balanced reaction shown,the mole ratio of Fe2S3 to O2 is
Fe2S3 + 4 O2 → 2 FeO + 3 SO2

Accepted Answer

A) 5 to 5. 
B) 1 to 4. 
C) 4 to 1. 
D) 1 to 2. 
E) 4 to 3. 
A) 5 to 5. 
B) 1 to 4. 
C) 4 to 1. 
D) 1 to 2. 
E) 4 to 3.

Question 11

In the reaction shown,how many moles of HCl are needed to react with 2.4 moles of Al?
2 Al + 6 HCl → 2 AlCl3 + 3 H2

Accepted Answer

A) 0.8 
B) 1.3 
C) 4.8 
D) 6.4 
E) 7.2 
A) 0.8 
B) 1.3 
C) 4.8 
D) 6.4 
E) 7.2

Question 12

Given the following balanced equation,answer the following:
C2H5OH + 3 O2 → 2 CO2 + 3 H2O
A)What is the theoretical yield of carbon dioxide in this reaction if 39.6 g of ethanol is burned in the presence of 54.8 g of oxygen?
B)What is the percent yield for this reaction if the actual amount of carbon dioxide formed is 45.5 grams?

Accepted Answer

A) This is a limiting reagent problem.Fi

Question 13

In the reaction 2 C + O2 → 2 CO,how many moles of carbon are needed to produce 66.0 g of carbon monoxide?

Accepted Answer

A) 0.424 
B) 1.18 
C) 2.36 
D) 4.71 
E) 28.3 
A) 0.424 
B) 1.18 
C) 2.36 
D) 4.71 
E) 28.3

Question 14

The molecular weight of PCl3 is ________ amu.

Accepted Answer

A) 66.42 
B) 136.00 
C) 137.33 
D) 139.00 
E) 199.26 
A) 66.42 
B) 136.00 
C) 137.33 
D) 139.00 
E) 199.26

Question 15

Match the following.
-The mass of 2.25 moles of

Accepted Answer

A) 212.4 g 
B) 219 g 
C) 225 g 
D) 208.2 g 
A) 212.4 g 
B) 219 g 
C) 225 g 
D) 208.2 g

Question 16

In a reaction to produce chlorine gas,the theoretical yield is 25.6g.What is the actual yield of the reaction if the percent yield is 83.5%?

Accepted Answer

A) 214 g 
B) 21.4 g 
C) 3.26 g 
D) 0.0326 g 
E) 2.56 g 
A) 214 g 
B) 21.4 g 
C) 3.26 g 
D) 0.0326 g 
E) 2.56 g

Question 17

The Haber process is used to make ammonia,which is an important source of nitrogen that can be metabolized by plants.Using the equation below,determine how many moles of ammonia will be formed from 8.55 mole of nitrogen.
N2(g)+ 3 H2(g)→ 2 NH3(g)

Accepted Answer

A) 4.28 mol 
B) 0.240 mol 
C) 5.7 mol 
D) 17.1 mol 
E) 12.8 mol 
A) 4.28 mol 
B) 0.240 mol 
C) 5.7 mol 
D) 17.1 mol 
E) 12.8 mol

Question 18

The number of grams in 7.00 moles of N2 is

Accepted Answer

A) 7 × (6.02 × 1023). 
B) 14.0. 
C) 28.0. 
D) 98.0. 
E) 196. 
A) 7 × (6.02 × 1023). 
B) 14.0. 
C) 28.0. 
D) 98.0. 
E) 196.

Question 19

Which quantity contains Avogadro's number of molecules?

Accepted Answer

A) 8.8 g CO2 
B) 34 g of NH3 
C) 9 g of H2O 
D) 98 g of H2SO4 
E) 73 g of HCl 
A) 8.8 g CO2 
B) 34 g of NH3 
C) 9 g of H2O 
D) 98 g of H2SO4 
E) 73 g of HCl

Question 20

Match the following.
-The mass of 1.22 moles of iron(II)nitrate

Accepted Answer

A) 212.4 g 
B) 219 g 
C) 225 g 
D) 208.2 g 
A) 212.4 g 
B) 219 g 
C) 225 g 
D) 208.2 g

Exam 6: Chemical Reactions: Mole and Mass Relationships

50.0 g of Cl2 contains ________ mol Cl2.

How many molecules are present in 3.25 mol of C2H6O?

A solution containing 145.0 g AgNO3 is mixed with a CaCl2 solution and 98.4 of AgCl is recovered.Calculate the % yield of the reaction.

The reaction N2 + 3 H2 → 2 NH3 is used to produce ammonia.When 450.g of hydrogen was reacted with nitrogen,1575 g of ammonia were produced.What is the percent yield of this reaction?

The combustion of propane gas is used to fuel barbeque grills.If 4.65 moles of propane,C3H8,are burned in a grilling session,how many moles of carbon dioxide gas are formed? C3H8(g)+ 5 O2(g)→ 3 CO2(g)+ 4 H2O(l)

How many molecules are present in 4.25 mol of CCl4?

Determine the number of moles of water produced when one mole of NH3 reacts according to the balanced reaction shown. 4 NH3 + 5 O2 → 4 NO + 6 H2O

The percentage yield of a reaction can best be described as the ________ times 100%.

The fuel for your car is a mixture of octane and several other hydrocarbons.What mass of CO2 will be produced when 125 g of C8H18 react completely in the following equation? 2 C8H18 + 25 O2 → 16 CO2 + 18 H2O

In the balanced reaction shown,the mole ratio of Fe2S3 to O2 is Fe2S3 + 4 O2 → 2 FeO + 3 SO2

In the reaction shown,how many moles of HCl are needed to react with 2.4 moles of Al? 2 Al + 6 HCl → 2 AlCl3 + 3 H2

In the reaction 2 C + O2 → 2 CO,how many moles of carbon are needed to produce 66.0 g of carbon monoxide?

The molecular weight of PCl3 is ________ amu.

Match the following. -The mass of 2.25 moles of

In a reaction to produce chlorine gas,the theoretical yield is 25.6g.What is the actual yield of the reaction if the percent yield is 83.5%?

The Haber process is used to make ammonia,which is an important source of nitrogen that can be metabolized by plants.Using the equation below,determine how many moles of ammonia will be formed from 8.55 mole of nitrogen. N2(g)+ 3 H2(g)→ 2 NH3(g)

The number of grams in 7.00 moles of N2 is

Which quantity contains Avogadro's number of molecules?

Match the following. -The mass of 1.22 moles of iron(II)nitrate

Matter and Measurements

Atoms and the Periodic Table

Ionic Compounds

Molecular Compounds

Classification and Balancing of Chemical Reactions

Chemical Reactions: Energy, rates, and Equilibrium

Gases, liquids, and Solids

Solutions

Acids and Bases

Nuclear Chemistry

Introduction to Organic Chemistry: Alkanes

Alkenes, alkynes, and Aromatic Compounds

Some Compounds With Oxygen, sulfur, or a Halogen

Aldehydes and Ketones

Amines

Carboxylic Acids and Their Derivatives

Amino Acids and Proteins

Enzymes and Vitamins

Carbohydrates

The Generation of Biochemical Energy

Carbohydrate Metabolism

Lipids

Lipid Metabolism

Protein and Amino Acid Metabolism

Nucleic Acids and Protein Synthesis

Genomics

Chemical Messengers: Hormones, neurotransmitters, and Drugs

Body Fluids

Filters

50.0 g of Cl₂ contains ________ mol Cl₂.

How many molecules are present in 3.25 mol of C₂H₆O?

A solution containing 145.0 g AgNO₃ is mixed with a CaCl₂ solution and 98.4 of AgCl is recovered.Calculate the % yield of the reaction.

The reaction N₂ + 3 H₂ → 2 NH₃ is used to produce ammonia.When 450.g of hydrogen was reacted with nitrogen,1575 g of ammonia were produced.What is the percent yield of this reaction?

The combustion of propane gas is used to fuel barbeque grills.If 4.65 moles of propane,C₃H₈,are burned in a grilling session,how many moles of carbon dioxide gas are formed? C₃H₈(g)+ 5 O₂(g)→ 3 CO₂(g)+ 4 H₂O(l)

How many molecules are present in 4.25 mol of CCl₄?

Determine the number of moles of water produced when one mole of NH₃ reacts according to the balanced reaction shown. 4 NH₃ + 5 O₂→ 4 NO + 6 H₂O

The fuel for your car is a mixture of octane and several other hydrocarbons.What mass of CO₂ will be produced when 125 g of C₈H₁₈ react completely in the following equation? 2 C₈H₁₈ + 25 O₂ → 16 CO₂ + 18 H₂O

In the balanced reaction shown,the mole ratio of Fe₂S₃ to O₂ is Fe₂S₃+ 4 O₂ → 2 FeO + 3 SO₂

In the reaction shown,how many moles of HCl are needed to react with 2.4 moles of Al? 2 Al + 6 HCl → 2 AlCl₃+ 3 H₂

In the reaction 2 C + O₂ → 2 CO,how many moles of carbon are needed to produce 66.0 g of carbon monoxide?

The molecular weight of PCl₃ is ________ amu.

The Haber process is used to make ammonia,which is an important source of nitrogen that can be metabolized by plants.Using the equation below,determine how many moles of ammonia will be formed from 8.55 mole of nitrogen. N₂(g)+ 3 H₂(g)→ 2 NH₃(g)

The number of grams in 7.00 moles of N₂ is