Question 1

A gold wire has a diameter of 1.00 mm. What length of this wire contains exactly 1.00 mol of gold? (density of Au = 17.0 g/cm3)

Accepted Answer

A) 2630 m 
B) 3.69 m 
C) 251 m 
D) 14.8 m 
E) 62.7 m 
A) 2630 m 
B) 3.69 m 
C) 251 m 
D) 14.8 m 
E) 62.7 m

Question 2

Boron obtained from borax deposits in Death Valley consists of two isotopes. They are boron-10 and boron-11 with atomic masses of 10.013 amu and 11.009 amu, respectively. The atomic mass of boron is 10.81 amu (see periodic table). Which isotope of boron is more abundant, boron-10 or boron-11?

Accepted Answer

A) Cannot be determined from data given 
B) Neither, their abundances are the same. 
C) Boron-10 
D) Boron-11 
A) Cannot be determined from data given 
B) Neither, their abundances are the same. 
C) Boron-10 
D) Boron-11

Question 3

Acetylene gas, HCCH(g), can be generated in the laboratory by adding calcium carbide to excess water, as shown in the following reaction
CaC2(s)+ H2O(l) $\rarr$HCCH(g)+ CaO(s)
How many grams of CaC2 would be required to generate 0.20 moles of HCCH(g)?

Accepted Answer

13 g of Ca

Question 4

What is the average mass, in grams, of one atom of iron?

Accepted Answer

A) 6.02 * 1023 g 
B) 1.66 * 10-24 g 
C) 9.28 * 10-23 g 
D) 55.85 g 
E) 55.85 * 10 -23 g 
A) 6.02 * 1023 g 
B) 1.66 * 10-24 g 
C) 9.28 * 10-23 g 
D) 55.85 g 
E) 55.85 * 10 -23 g

Question 5

One nanogram does not seem like a very large number. How many magnesium atoms are there in 1.00 ng of magnesium?

Accepted Answer

A) 4.11 * 10-11 atoms 
B) 2.48 * 1013 atoms 
C) 6.83 * 10-35 atoms 
D) 6.02 * 1014 atoms 
E) 1.46 * 1034 atoms 
A) 4.11 * 10-11 atoms 
B) 2.48 * 1013 atoms 
C) 6.83 * 10-35 atoms 
D) 6.02 * 1014 atoms 
E) 1.46 * 1034 atoms

Question 6

Ferrocene, Fe(C5H5)2(s), can be prepared by reacting 3.0 g of FeCl2(s)with an equal mass of cyclopentadiene, C5H6(l), and an excess of KOH, as shown in the following reaction
FeCl2 + 2C5H6 + 2KOH $\rarr$ FeC10H10 + 2H2O
A. What is the limiting reagent in this procedure?
B. Based on your answer to part A, what mass of Fe(C5H5)2 could theoretically be formed?
C. A student who carried out this reaction obtained 2.7 g of ferrocene. What was the percent yield for this reaction?

Accepted Answer

A. C₅H₆ is limiting B.

Question 7

How many grams of sodium are there in 10. g of sodium sulfate, Na2SO4?

Accepted Answer

A) 0.16 g 
B) 0.32 g 
C) 3.2 g 
D) 1.6 g 
E) 142 g 
A) 0.16 g 
B) 0.32 g 
C) 3.2 g 
D) 1.6 g 
E) 142 g

Question 8

When a chemical equation is balanced, it will have a set of whole number coefficients that cannot be reduced to smaller whole numbers. What is the coefficient for O2 when the following combustion reaction of a hydrocarbon is balanced? ___ C7H14 + ___ O2 $\rarr$ ___ CO2 + ___ H2O

Accepted Answer

A) 42 
B) 21 
C) 11 
D) 10 
E) none of these 
A) 42 
B) 21 
C) 11 
D) 10 
E) none of these

Question 9

What is the molar mass of nicotine, C10H14N2?

Accepted Answer

A) 134 g/mol 
B) 148 g/mol 
C) 158 g/mol 
D) 210 g/mol 
E) 162 g/mol 
A) 134 g/mol 
B) 148 g/mol 
C) 158 g/mol 
D) 210 g/mol 
E) 162 g/mol

Question 10

One mole of iron

Accepted Answer

A) is heavier than one mole of lead (Pb). 
B) is 77.0 g of iron. 
C) is 26.0 g of iron. 
D) weighs the same as one mole of lead. 
E) None of the above. 
A) is heavier than one mole of lead (Pb). 
B) is 77.0 g of iron. 
C) is 26.0 g of iron. 
D) weighs the same as one mole of lead. 
E) None of the above.

Question 11

Calculate the mass of 4.50 moles of chlorine gas, Cl2.

Accepted Answer

A) 6.34 * 10 -2 g 
B) 4.5 g 
C) 15.7 g 
D) 160 g 
E) 319 g 
A) 6.34 * 10 -2 g 
B) 4.5 g 
C) 15.7 g 
D) 160 g 
E) 319 g

Question 12

Vanadium(V)oxide reacts with calcium according to the chemical equation below. When 10.0 moles of V2O5 are mixed with 10.0 moles of Ca, which is the limiting reagent? V2O5(s)+ 5Ca(l) $\rarr$ 2V(l)+ 5CaO(s)

Accepted Answer

A) V2O5 
B) Ca 
C) V 
D) CaO 
E) No reagent is limiting. 
A) V2O5 
B) Ca 
C) V 
D) CaO 
E) No reagent is limiting.

Question 13

How many moles of oxygen atoms are there in 10 moles of KClO3?

Accepted Answer

A) 3 mol 
B) 3.3 mol 
C) 10 mol 
D) 30 mol 
E) 6.02 * 1024 mol 
A) 3 mol 
B) 3.3 mol 
C) 10 mol 
D) 30 mol 
E) 6.02 * 1024 mol

Question 14

One way of obtaining pure sodium carbonate is through the decomposition of the mineral trona, Na5(CO3)2(HCO3) $\rarr$2H2O, as shown in the following reaction: 2Na3(CO3)(HCO3)$\rarr$2H2O(s)F1F1$\rarr$ 3Na2CO3(s)+ CO2(g)+ 5H2O(g)
When 15 metric ton (1 * 103 kg)of trona is decomposed, 11 metric ton of Na2CO3 is recovered. What is the percent yield of this reaction? (1 metric ton = 103 kg)

Accepted Answer

A) 95% 
B) 73% 
C) 65% 
D) 42% 
E) 13% 
A) 95% 
B) 73% 
C) 65% 
D) 42% 
E) 13%

Question 15

What is the mass of 0.0250 mol of P2O5?

Accepted Answer

A) 35.5 g 
B) 5676 g 
C) 0.0250 g 
D) 1.51 * 1022 g 
E) 3.55 g 
A) 35.5 g 
B) 5676 g 
C) 0.0250 g 
D) 1.51 * 1022 g 
E) 3.55 g

Question 16

How many O atoms are there in 51.4 g CaSO4?

Accepted Answer

A) 4 
B) 2.40 * 1024 
C) 1.13 
D) 9.09 * 1023 
E) 2.28 * 1023 
A) 4 
B) 2.40 * 1024 
C) 1.13 
D) 9.09 * 1023 
E) 2.28 * 1023

Question 17

What is the theoretical yield of vanadium, in moles, that can be produced by the reaction of 2.0 mole of V2O5 with 6.0 mole of calcium based on the following chemical reaction? V2O5(s)+ 5Ca(l) $\rarr$ 2V(l)+ 5CaO(s)

Accepted Answer

A) 1.0 mol 
B) 1.6 mol 
C) 2.0 mol 
D) 2.4 mol 
E) 4.0 mol 
A) 1.0 mol 
B) 1.6 mol 
C) 2.0 mol 
D) 2.4 mol 
E) 4.0 mol

Question 18

Balance the equation below using the smallest set of whole numbers. What is the coefficient of H2O?
 ___ PCl3(l)+ ___ H2O(l) $\rarr$ ___ H3PO3(aq) + ___ HCl(aq)

Accepted Answer

A) 1 
B) 2 
C) 3 
D) 5 
E) none of these 
A) 1 
B) 2 
C) 3 
D) 5 
E) none of these

Question 19

Calculate the mass of sodium chlorate that must be decomposed to form 6.5 g of oxygen.
2NaClO3(s) $\rarr$2NaCl(s)+ 3O2(g)

Accepted Answer

Question 20

Define a mole.

Accepted Answer

An Avogadro's number

A gold wire has a diameter of 1.00 mm. What length of this wire contains exactly 1.00 mol of gold? (density of Au = 17.0 g/cm³)

Boron obtained from borax deposits in Death Valley consists of two isotopes. They are boron-10 and boron-11 with atomic masses of 10.013 amu and 11.009 amu, respectively. The atomic mass of boron is 10.81 amu (see periodic table). Which isotope of boron is more abundant, boron-10 or boron-11?

Acetylene gas, HCCH(g), can be generated in the laboratory by adding calcium carbide to excess water, as shown in the following reaction CaC₂(s)+ H₂O(l) $\rarr$ HCCH(g)+ CaO(s) How many grams of CaC₂ would be required to generate 0.20 moles of HCCH(g)?

What is the average mass, in grams, of one atom of iron?

One nanogram does not seem like a very large number. How many magnesium atoms are there in 1.00 ng of magnesium?

How many grams of sodium are there in 10. g of sodium sulfate, Na₂SO₄?

When a chemical equation is balanced, it will have a set of whole number coefficients that cannot be reduced to smaller whole numbers. What is the coefficient for O₂ when the following combustion reaction of a hydrocarbon is balanced? _ C₇H₁₄ + _ O₂ $\rarr$ _ CO₂ + _ H₂O

What is the molar mass of nicotine, C₁₀H₁₄N₂?

One mole of iron

Calculate the mass of 4.50 moles of chlorine gas, Cl₂.

Vanadium(V)oxide reacts with calcium according to the chemical equation below. When 10.0 moles of V₂O₅ are mixed with 10.0 moles of Ca, which is the limiting reagent? V₂O₅(s)+ 5Ca(l) $\rarr$ 2V(l)+ 5CaO(s)

How many moles of oxygen atoms are there in 10 moles of KClO₃?

What is the mass of 0.0250 mol of P₂O₅?

How many O atoms are there in 51.4 g CaSO₄?

What is the theoretical yield of vanadium, in moles, that can be produced by the reaction of 2.0 mole of V₂O₅ with 6.0 mole of calcium based on the following chemical reaction? V₂O₅(s)+ 5Ca(l) $\rarr$ 2V(l)+ 5CaO(s)

Balance the equation below using the smallest set of whole numbers. What is the coefficient of H₂O? _ PCl₃(l)+ _ H₂O(l) $\rarr$ _ H₃PO₃(aq)+ _ HCl(aq)

Calculate the mass of sodium chlorate that must be decomposed to form 6.5 g of oxygen. 2NaClO₃(s) $\rarr$ 2NaCl(s)+ 3O₂(g)

Define a mole.

Introduction

Atoms, Molecules, and Ions

Reactions in Aqueous Solution

Gases

Energy Relationships in Chemical Reactions

The Electronic Structure of Atoms

The Periodic Table

Chemical Bonding I: the Covalent Bond

Chemical Bonding Ii: Molecular Geometry and Hybridization of Atomic Orbitals

Introduction to Organic Chemistry

Intermolecular Forces and Liquids and Solids

Physical Properties of Solutions

Chemical Kinetics

Chemical Equilibrium

Acids and Bases

Acid-Base Equilibria and Solubility Equilibria

Thermodynamics

Redox Reactions and Electrochemistry

The Chemistry of Coordination Compounds

Nuclear Chemistry

Organic Polymerssynthetic and Natural

Filters

Exam 3: Stoichiometry

A gold wire has a diameter of 1.00 mm. What length of this wire contains exactly 1.00 mol of gold? (density of Au = 17.0 g/cm3)

Boron obtained from borax deposits in Death Valley consists of two isotopes. They are boron-10 and boron-11 with atomic masses of 10.013 amu and 11.009 amu, respectively. The atomic mass of boron is 10.81 amu (see periodic table). Which isotope of boron is more abundant, boron-10 or boron-11?

Acetylene gas, HCCH(g), can be generated in the laboratory by adding calcium carbide to excess water, as shown in the following reaction CaC2(s)+ H2O(l) →\rarr→ HCCH(g)+ CaO(s) How many grams of CaC2 would be required to generate 0.20 moles of HCCH(g)?

What is the average mass, in grams, of one atom of iron?

One nanogram does not seem like a very large number. How many magnesium atoms are there in 1.00 ng of magnesium?

How many grams of sodium are there in 10. g of sodium sulfate, Na2SO4?

When a chemical equation is balanced, it will have a set of whole number coefficients that cannot be reduced to smaller whole numbers. What is the coefficient for O2 when the following combustion reaction of a hydrocarbon is balanced? ___ C7H14 + ___ O2 →\rarr→ ___ CO2 + ___ H2O

What is the molar mass of nicotine, C10H14N2?

One mole of iron

Calculate the mass of 4.50 moles of chlorine gas, Cl2.

Vanadium(V)oxide reacts with calcium according to the chemical equation below. When 10.0 moles of V2O5 are mixed with 10.0 moles of Ca, which is the limiting reagent? V2O5(s)+ 5Ca(l) →\rarr→ 2V(l)+ 5CaO(s)

How many moles of oxygen atoms are there in 10 moles of KClO3?

What is the mass of 0.0250 mol of P2O5?

How many O atoms are there in 51.4 g CaSO4?

What is the theoretical yield of vanadium, in moles, that can be produced by the reaction of 2.0 mole of V2O5 with 6.0 mole of calcium based on the following chemical reaction? V2O5(s)+ 5Ca(l) →\rarr→ 2V(l)+ 5CaO(s)

Balance the equation below using the smallest set of whole numbers. What is the coefficient of H2O? ___ PCl3(l)+ ___ H2O(l) →\rarr→ ___ H3PO3(aq) + ___ HCl(aq)

Calculate the mass of sodium chlorate that must be decomposed to form 6.5 g of oxygen. 2NaClO3(s) →\rarr→ 2NaCl(s)+ 3O2(g)

Define a mole.

Introduction

Atoms, Molecules, and Ions

Reactions in Aqueous Solution

Gases

Energy Relationships in Chemical Reactions

The Electronic Structure of Atoms

The Periodic Table

Chemical Bonding I: the Covalent Bond

Chemical Bonding Ii: Molecular Geometry and Hybridization of Atomic Orbitals

Introduction to Organic Chemistry

Intermolecular Forces and Liquids and Solids

Physical Properties of Solutions

Chemical Kinetics

Chemical Equilibrium

Acids and Bases

Acid-Base Equilibria and Solubility Equilibria

Thermodynamics

Redox Reactions and Electrochemistry

The Chemistry of Coordination Compounds

Nuclear Chemistry

Organic Polymerssynthetic and Natural

Filters

A gold wire has a diameter of 1.00 mm. What length of this wire contains exactly 1.00 mol of gold? (density of Au = 17.0 g/cm³)

Acetylene gas, HCCH(g), can be generated in the laboratory by adding calcium carbide to excess water, as shown in the following reaction CaC₂(s)+ H₂O(l) $\rarr$ HCCH(g)+ CaO(s) How many grams of CaC₂ would be required to generate 0.20 moles of HCCH(g)?

How many grams of sodium are there in 10. g of sodium sulfate, Na₂SO₄?

When a chemical equation is balanced, it will have a set of whole number coefficients that cannot be reduced to smaller whole numbers. What is the coefficient for O₂ when the following combustion reaction of a hydrocarbon is balanced? _ C₇H₁₄ + _ O₂ $\rarr$ _ CO₂ + _ H₂O

What is the molar mass of nicotine, C₁₀H₁₄N₂?

Calculate the mass of 4.50 moles of chlorine gas, Cl₂.

Vanadium(V)oxide reacts with calcium according to the chemical equation below. When 10.0 moles of V₂O₅ are mixed with 10.0 moles of Ca, which is the limiting reagent? V₂O₅(s)+ 5Ca(l) $\rarr$ 2V(l)+ 5CaO(s)

How many moles of oxygen atoms are there in 10 moles of KClO₃?

What is the mass of 0.0250 mol of P₂O₅?

How many O atoms are there in 51.4 g CaSO₄?

What is the theoretical yield of vanadium, in moles, that can be produced by the reaction of 2.0 mole of V₂O₅ with 6.0 mole of calcium based on the following chemical reaction? V₂O₅(s)+ 5Ca(l) $\rarr$ 2V(l)+ 5CaO(s)

Balance the equation below using the smallest set of whole numbers. What is the coefficient of H₂O? _ PCl₃(l)+ _ H₂O(l) $\rarr$ _ H₃PO₃(aq)+ _ HCl(aq)

Calculate the mass of sodium chlorate that must be decomposed to form 6.5 g of oxygen. 2NaClO₃(s) $\rarr$ 2NaCl(s)+ 3O₂(g)