Question 1

What does the balanced equation given below mean?
CH4 + 2 O2 → CO2 + 2H2O

Accepted Answer

A) One mole of methane reacts with two moles of oxygen to produce one mole of carbon dioxide and two moles of water. 
B) One gram of methane reacts with two grams of oxygen to produce one gram of carbon dioxide and two grams of water. 
C) One molecule of methane reacts with two molecules of oxygen to produce one molecule of carbon dioxide and two molecules of water. 
D) A,B,and C are correct. 
E) A and C are correct. 
A) One mole of methane reacts with two moles of oxygen to produce one mole of carbon dioxide and two moles of water. 
B) One gram of methane reacts with two grams of oxygen to produce one gram of carbon dioxide and two grams of water. 
C) One molecule of methane reacts with two molecules of oxygen to produce one molecule of carbon dioxide and two molecules of water. 
D) A,B,and C are correct. 
E) A and C are correct.

Question 2

How many moles of NaHCO3 are present in a 2.00 g sample?

Accepted Answer

A) 2.38 × 10-2 mol 
B) 1.27 × 10-2 mol 
C) 2.00 mol 
D) 85.0 mol 
E) 168 mol 
A) 2.38 × 10-2 mol 
B) 1.27 × 10-2 mol 
C) 2.00 mol 
D) 85.0 mol 
E) 168 mol

Question 3

In a reaction to produce ammonia,the theoretical yield is 420.g.What is the percent yield if the actual yield is 350.g?

Accepted Answer

A) 20.0% 
B) 83.3% 
C) 16.7% 
D) 120% 
E) 105% 
A) 20.0% 
B) 83.3% 
C) 16.7% 
D) 120% 
E) 105%

Question 4

Acid rain forms in the upper atmosphere by the reaction of sulfur trioxide with water forming sulfuric acid.Calculate the mass in grams of 5.65 × 1021 molecules of SO3.

Accepted Answer

A) 2.72 × 1047 g 
B) 1.17 × 10-4 g 
C) 0.751 g 
D) 0.0751 g 
E) 1.17 g 
A) 2.72 × 1047 g 
B) 1.17 × 10-4 g 
C) 0.751 g 
D) 0.0751 g 
E) 1.17 g

Question 5

In the reaction shown,what is the mole ratio that would be used to determine the number of moles of oxygen needed to react with 3.2 moles of C4H10?
2 C4H10+ 13O2→ 8 CO2+ 10 H2O

Accepted Answer

A)    
B)    
C)    
D)    
E)    
A)    
B)    
C)    
D)    
E)

Question 6

If a tablet of acetaminophen,C8H9NO2,weighs 324 mg,how many moles are there in the tablet?

Accepted Answer

A) 2.15 × 10-3 
B) 48.9 
C) 4.89 × 104 
D)  2.15 
E) 466 
A) 2.15 × 10-3 
B) 48.9 
C) 4.89 × 104 
D)  2.15 
E) 466

Question 7

Which statement concerning the mole is not correct?

Accepted Answer

A) The molar mass of any compound is equal to its molecular weight in grams. 
B) A mole of metal contains NA atoms of that metal. 
C) A mole of any compound contains one mole of each kind of atom found in that compound. 
D) A mole of a diatomic element contains 2 × NA moles of atoms of the element. 
E) All of these statements are correct. 
A) The molar mass of any compound is equal to its molecular weight in grams. 
B) A mole of metal contains NA atoms of that metal. 
C) A mole of any compound contains one mole of each kind of atom found in that compound. 
D) A mole of a diatomic element contains 2 × NA moles of atoms of the element. 
E) All of these statements are correct.

Question 8

Interpret in words the equation shown.
P4O10(s)+ 6 H2O(l)→ 4 H3PO4(aq)

Accepted Answer

A) One mole of solid tetraphosphorus decaoxide reacts with six moles of liquid water to produce four moles of phosphoric acid solution. 
B) Zero moles of solid phosphoric oxide dissolve in six moles of water to produce four moles of phosphorous acid. 
C) One mole of phosphorus(X)oxide combines with six moles of water to produce four moles of solution of hydrogen phosphate. 
D) Four moles of solid phosphorus,five moles of diatomic oxygen gas,and six moles of liquid water react together to produce four moles of phosphoric acid in solution. 
E) Four atoms of phosphorus,16 atoms of oxygen,and 12 atoms of hydrogen rearrange to produce four molecules of phosphoric acid. 
A) One mole of solid tetraphosphorus decaoxide reacts with six moles of liquid water to produce four moles of phosphoric acid solution. 
B) Zero moles of solid phosphoric oxide dissolve in six moles of water to produce four moles of phosphorous acid. 
C) One mole of phosphorus(X)oxide combines with six moles of water to produce four moles of solution of hydrogen phosphate. 
D) Four moles of solid phosphorus,five moles of diatomic oxygen gas,and six moles of liquid water react together to produce four moles of phosphoric acid in solution. 
E) Four atoms of phosphorus,16 atoms of oxygen,and 12 atoms of hydrogen rearrange to produce four molecules of phosphoric acid.

Question 9

Which statement based on the mole concept is not correct?

Accepted Answer

A) The molar mass of a diatomic element is its atomic weight in grams times two. 
B) The number of atoms in one mole of platinum is the same as the number of atoms in one mole of uranium. 
C) One mole of sodium chloride,NaCl,contains the same number of ions as one mole of calcium sulfate,CaSO4. 
D) One mole of methane,CH4,contains the same number of atoms as one mole of carbon dioxide,CO2. 
E) One mole of bromine,Br2,contains the same number of molecules as one mole of propane,C3H8. 
A) The molar mass of a diatomic element is its atomic weight in grams times two. 
B) The number of atoms in one mole of platinum is the same as the number of atoms in one mole of uranium. 
C) One mole of sodium chloride,NaCl,contains the same number of ions as one mole of calcium sulfate,CaSO4. 
D) One mole of methane,CH4,contains the same number of atoms as one mole of carbon dioxide,CO2. 
E) One mole of bromine,Br2,contains the same number of molecules as one mole of propane,C3H8.

Question 10

Which is the limiting reactant when 3.00 g of calcium are reacted with 8.00 g of water to produce hydrogen gas in the following equation?
Ca(s)+ 2 H2O(l)→ Ca(OH)2(aq)+ H2(g)

Accepted Answer

A) Ca 
B) H2O 
C) Ca(OH)2 
D) H2 
E) not enough information is given 
A) Ca 
B) H2O 
C) Ca(OH)2 
D) H2 
E) not enough information is given

Question 11

Ammonium sulfate is a common component of fertilizer.Calculate it's formula weight.

Accepted Answer

A) 63.07 amu 
B) 118.13 amu 
C) 132.13 amu 
D) 128.11 amu 
E) 114.10 amu 
A) 63.07 amu 
B) 118.13 amu 
C) 132.13 amu 
D) 128.11 amu 
E) 114.10 amu

Question 12

The formula mass of copper(II)chloride is ________ g.

Accepted Answer

A) 98.90 
B) 133.00 
C) 134.45 
D) 162.53 
E) 197.80 
A) 98.90 
B) 133.00 
C) 134.45 
D) 162.53 
E) 197.80

Question 13

Match the following.
-The molar mass of BaC

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 14

The formula weight of Al2(SO4)3 is ________ grams.

Accepted Answer

A) 214.14 
B) 278.02 
C) 315.14 
D) 342.14 
E) 450.14 
A) 214.14 
B) 278.02 
C) 315.14 
D) 342.14 
E) 450.14

Question 15

The following equation represents the formation of nitrogen dioxide,a major component of smog,
2 NO + O2 → 2 NO2
If 0.68 mole of NO is reacted with 0.79 mole of O2 to produce NO2,the limiting reactant is

Accepted Answer

A) both NO and O2. 
B) NO. 
C) O2. 
D) NO2. 
A) both NO and O2. 
B) NO. 
C) O2. 
D) NO2.

Question 16

The combustion of propane gas (C3H8)is used to fuel barbeque grills.In order to produce 5.65 moles of water how many moles of oxygen gas are needed?
C3H8(g)+ 5 O2(g)→ 3 CO2(g)+ 4 H2O(l)

Accepted Answer

A) 3.39 mol 
B) 4.52 mol 
C) 7.06 mol 
D) 1.13 mol 
E) 1.41 mol 
A) 3.39 mol 
B) 4.52 mol 
C) 7.06 mol 
D) 1.13 mol 
E) 1.41 mol

Question 17

How much Ca(NO3)2 should be weighed out to have 0.650 mol?

Accepted Answer

A) 66.4 g 
B) 97.6 g 
C) 107 g 
D) 133 g 
E) 165 g 
A) 66.4 g 
B) 97.6 g 
C) 107 g 
D) 133 g 
E) 165 g

Exam 6: Chemical Reactions: Mole and Mass Relationships

What does the balanced equation given below mean? CH4 + 2 O2 → CO2 + 2H2O

How many moles of NaHCO3 are present in a 2.00 g sample?

In a reaction to produce ammonia,the theoretical yield is 420.g.What is the percent yield if the actual yield is 350.g?

Acid rain forms in the upper atmosphere by the reaction of sulfur trioxide with water forming sulfuric acid.Calculate the mass in grams of 5.65 × 1021 molecules of SO3.

In the reaction shown,what is the mole ratio that would be used to determine the number of moles of oxygen needed to react with 3.2 moles of C4H10? 2 C4H10+ 13O2→ 8 CO2+ 10 H2O

If a tablet of acetaminophen,C8H9NO2,weighs 324 mg,how many moles are there in the tablet?

Which statement concerning the mole is not correct?

Interpret in words the equation shown. P4O10(s)+ 6 H2O(l)→ 4 H3PO4(aq)

Which statement based on the mole concept is not correct?

Which is the limiting reactant when 3.00 g of calcium are reacted with 8.00 g of water to produce hydrogen gas in the following equation? Ca(s)+ 2 H2O(l)→ Ca(OH)2(aq)+ H2(g)

Ammonium sulfate is a common component of fertilizer.Calculate it's formula weight.

The formula mass of copper(II)chloride is ________ g.

Match the following. -The molar mass of BaC

The formula weight of Al2(SO4)3 is ________ grams.

The following equation represents the formation of nitrogen dioxide,a major component of smog, 2 NO + O2 → 2 NO2 If 0.68 mole of NO is reacted with 0.79 mole of O2 to produce NO2,the limiting reactant is

The combustion of propane gas (C3H8)is used to fuel barbeque grills.In order to produce 5.65 moles of water how many moles of oxygen gas are needed? C3H8(g)+ 5 O2(g)→ 3 CO2(g)+ 4 H2O(l)

How much Ca(NO3)2 should be weighed out to have 0.650 mol?

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

What does the balanced equation given below mean? CH₄ + 2 O₂ → CO₂ + 2H₂O

How many moles of NaHCO₃ are present in a 2.00 g sample?

Acid rain forms in the upper atmosphere by the reaction of sulfur trioxide with water forming sulfuric acid.Calculate the mass in grams of 5.65 × 10²¹ molecules of SO₃.

In the reaction shown,what is the mole ratio that would be used to determine the number of moles of oxygen needed to react with 3.2 moles of C₄H₁₀? 2 C₄H₁₀+ 13O₂→ 8 CO₂+ 10 H₂O

If a tablet of acetaminophen,C₈H₉NO₂,weighs 324 mg,how many moles are there in the tablet?

Interpret in words the equation shown. P₄O₁₀(s)+ 6 H₂O(l)→ 4 H₃PO₄(aq)

Which is the limiting reactant when 3.00 g of calcium are reacted with 8.00 g of water to produce hydrogen gas in the following equation? Ca(s)+ 2 H₂O(l)→ Ca(OH)₂(aq)+ H₂(g)

The formula weight of Al₂(SO₄)₃ is ________ grams.

The following equation represents the formation of nitrogen dioxide,a major component of smog, 2 NO + O₂ → 2 NO₂ If 0.68 mole of NO is reacted with 0.79 mole of O₂ to produce NO₂,the limiting reactant is

The combustion of propane gas (C₃H₈)is used to fuel barbeque grills.In order to produce 5.65 moles of water how many moles of oxygen gas are needed? C₃H₈(g)+ 5 O₂(g)→ 3 CO₂(g)+ 4 H₂O(l)

How much Ca(NO₃)₂ should be weighed out to have 0.650 mol?