Question 1

Balance the following chemical equation:
C + Fe2O3 $\rarr$ Fe + CO

Accepted Answer

Question 2

How many sulfur atoms are present in 25.6 g of Al2(S2O3)3?

Accepted Answer

A) 0.393 
B) 6 
C) 3.95 * 1022 
D) 7.90 * 1022 
E) 2.37 * 1023 
A) 0.393 
B) 6 
C) 3.95 * 1022 
D) 7.90 * 1022 
E) 2.37 * 1023

Question 3

What is the mass of 3.00 moles of ethanol, C2H6O?

Accepted Answer

A) 4.99 * 10-24 g 
B) 138 g 
C) 6.52 * 10-2 g 
D) 50 g 
E) 1.81 * 1024 g 
A) 4.99 * 10-24 g 
B) 138 g 
C) 6.52 * 10-2 g 
D) 50 g 
E) 1.81 * 1024 g

Question 4

Which of the following statements are true about a sample of sulfur and a sample of oxygen if the two samples are of equal mass?
I. The number of electrons in the two samples is about the same.
II. The number of protons in the two samples is about the same.
III. The number of atoms in the two samples is about the same.
IV. There are roughly twice as many sulfur atoms as oxygen atoms.
V. There are roughly twice as many oxygen atoms as sulfur atoms.

Accepted Answer

The answer of Which of the following statements are true...

Question 5

Calculate the molecular mass of potassium permanganate, KMnO4.

Accepted Answer

A) 52 amu 
B) 70 amu 
C) 110 amu 
D) 158 amu 
E) 176 amu 
A) 52 amu 
B) 70 amu 
C) 110 amu 
D) 158 amu 
E) 176 amu

Question 6

Calculate the molecular mass, in g/mol, of H2SO4.

Accepted Answer

Question 7

Balance the following chemical equation:
NH3 + H2SO4 $\rarr$(NH4)2SO4

Accepted Answer

Question 8

Balance the following chemical equation:
NaNO3 $\rarr$ NaNO2 + O2

Accepted Answer

Question 9

When a 0.952 g sample of an organic compound containing C, H, and O is burned completely in oxygen, 1.35 g of CO2 and 0.826 g of H2O are produced. What is the empirical formula of the compound?

Accepted Answer

Question 10

The Hall process for the production of aluminum involves the reaction of aluminum oxide with elemental carbon to give aluminum metal and carbon monoxide. If the yield of this reaction is 75%, what mass of aluminum metal can be produced from the reaction of 1.65 * 106 of aluminum oxide with 1.50 * 106 g of carbon?

Accepted Answer

A) 1.6 * 105 g 
B) 3.3 * 105 g 
C) 6.6 * 105 g 
D) 8.7 * 105 g 
E) 1.7 * 106 g 
A) 1.6 * 105 g 
B) 3.3 * 105 g 
C) 6.6 * 105 g 
D) 8.7 * 105 g 
E) 1.7 * 106 g

Question 11

How many sulfur atoms are there in 21.0 g of Al2S3?

Accepted Answer

A) 8.42 * 1022 atoms 
B) 2.53 * 1023 atoms 
C) 2.14 * 1023 atoms 
D) 6.02 * 1023 atoms 
E) 6.30 * 1026 atoms 
A) 8.42 * 1022 atoms 
B) 2.53 * 1023 atoms 
C) 2.14 * 1023 atoms 
D) 6.02 * 1023 atoms 
E) 6.30 * 1026 atoms

Question 12

How many carbon atoms are there in 10 lbs of sugar, C12H22O11?

Accepted Answer

A) 9.6 * 1025 atoms 
B) 8.0 * 1024 atoms 
C) 159 atoms 
D) 4.21 atoms 
E) 342 atoms 
A) 9.6 * 1025 atoms 
B) 8.0 * 1024 atoms 
C) 159 atoms 
D) 4.21 atoms 
E) 342 atoms

Question 13

A 0.600 g sample of a compound of arsenic and oxygen was found to contain 0.454 g of arsenic. What is the empirical formula of the compound?

Accepted Answer

The answer of A 0.600 g sample of a compound...

Question 14

Ammonia reacts with diatomic oxygen to form nitric oxide and water vapor: 4NH3 + 5O2 $\rarr$ 4NO + 6H2O
When 20.0 g NH3 and 50.0 g O2 are allowed to react, which is the limiting reagent?

Accepted Answer

A) NH3 
B) O2 
C) NO 
D) H2O 
E) No reagent is limiting. 
A) NH3 
B) O2 
C) NO 
D) H2O 
E) No reagent is limiting.

Question 15

How many moles of CF4 are there in 171 g of CF4?

Accepted Answer

A) 0.51 mol 
B) 1.94 mol 
C) 4.07 mol 
D) 88.0 mol 
E) 171 mol 
A) 0.51 mol 
B) 1.94 mol 
C) 4.07 mol 
D) 88.0 mol 
E) 171 mol

Question 16

Balance the following chemical equation:
P4O10 + H2O $\rarr$H3PO4

Accepted Answer

Question 17

An organic thiol compound is 38.66% C, 9.73% H, and 51.61% S by mass. What is the empirical formula of this compound?

Accepted Answer

A) C2H6S 
B) C3H8S 
C) C4H10S 
D) C4H12S 
E) C5H14S 
A) C2H6S 
B) C3H8S 
C) C4H10S 
D) C4H12S 
E) C5H14S

Question 18

What is the limiting reagent when 27.0 g of P and 68.0 g of I2 react according to the following chemical equation?
2P(s)+ 3I2(s) $\rarr$2PI3(s)

Accepted Answer

Question 19

Calculate the mass of excess reagent remaining at the end of the reaction in which 90.0 g of SO2 are mixed with 100.0 g of O2. 2SO2 + O2$\rarr$ 2SO3

Accepted Answer

A) 11.5 g 
B) 22.5 g 
C) 67.5 g 
D) 77.5 g 
E) 400 g 
A) 11.5 g 
B) 22.5 g 
C) 67.5 g 
D) 77.5 g 
E) 400 g

Question 20

What is the theoretical yield of PI3 from the reaction of 27.0 g of P and 68.0 g of I2?
2P(s)+ 3I2(s) $\rarr$2PI3(s)

Accepted Answer

Balance the following chemical equation: C + Fe₂O₃ $\rarr$ Fe + CO

How many sulfur atoms are present in 25.6 g of Al₂(S₂O₃)₃?

What is the mass of 3.00 moles of ethanol, C₂H₆O?

Calculate the molecular mass of potassium permanganate, KMnO₄.

Calculate the molecular mass, in g/mol, of H₂SO₄.

Balance the following chemical equation: NH₃ + H₂SO₄ $\rarr$ (NH₄)₂SO₄

Balance the following chemical equation: NaNO₃ $\rarr$ NaNO₂ + O₂

When a 0.952 g sample of an organic compound containing C, H, and O is burned completely in oxygen, 1.35 g of CO₂ and 0.826 g of H₂O are produced. What is the empirical formula of the compound?

How many sulfur atoms are there in 21.0 g of Al₂S₃?

How many carbon atoms are there in 10 lbs of sugar, C₁₂H₂₂O₁₁?

A 0.600 g sample of a compound of arsenic and oxygen was found to contain 0.454 g of arsenic. What is the empirical formula of the compound?

Ammonia reacts with diatomic oxygen to form nitric oxide and water vapor: 4NH₃ + 5O₂ $\rarr$ 4NO + 6H₂O When 20.0 g NH₃ and 50.0 g O₂ are allowed to react, which is the limiting reagent?

How many moles of CF₄ are there in 171 g of CF₄?

Balance the following chemical equation: P₄O₁₀ + H₂O $\rarr$ H₃PO₄

An organic thiol compound is 38.66% C, 9.73% H, and 51.61% S by mass. What is the empirical formula of this compound?

What is the limiting reagent when 27.0 g of P and 68.0 g of I₂ react according to the following chemical equation? 2P(s)+ 3I₂(s) $\rarr$ 2PI₃(s)

Calculate the mass of excess reagent remaining at the end of the reaction in which 90.0 g of SO₂ are mixed with 100.0 g of O₂. 2SO₂ + O₂ $\rarr$ 2SO₃

What is the theoretical yield of PI₃ from the reaction of 27.0 g of P and 68.0 g of I₂? 2P(s)+ 3I₂(s) $\rarr$ 2PI₃(s)

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

Balance the following chemical equation: C + Fe2O3 →\rarr→ Fe + CO

How many sulfur atoms are present in 25.6 g of Al2(S2O3)3?

What is the mass of 3.00 moles of ethanol, C2H6O?

Calculate the molecular mass of potassium permanganate, KMnO4.

Calculate the molecular mass, in g/mol, of H2SO4.

Balance the following chemical equation: NH3 + H2SO4 →\rarr→ (NH4)2SO4

Balance the following chemical equation: NaNO3 →\rarr→ NaNO2 + O2

When a 0.952 g sample of an organic compound containing C, H, and O is burned completely in oxygen, 1.35 g of CO2 and 0.826 g of H2O are produced. What is the empirical formula of the compound?

How many sulfur atoms are there in 21.0 g of Al2S3?

How many carbon atoms are there in 10 lbs of sugar, C12H22O11?

A 0.600 g sample of a compound of arsenic and oxygen was found to contain 0.454 g of arsenic. What is the empirical formula of the compound?

Ammonia reacts with diatomic oxygen to form nitric oxide and water vapor: 4NH3 + 5O2 →\rarr→ 4NO + 6H2O When 20.0 g NH3 and 50.0 g O2 are allowed to react, which is the limiting reagent?

How many moles of CF4 are there in 171 g of CF4?

Balance the following chemical equation: P4O10 + H2O →\rarr→ H3PO4

An organic thiol compound is 38.66% C, 9.73% H, and 51.61% S by mass. What is the empirical formula of this compound?

What is the limiting reagent when 27.0 g of P and 68.0 g of I2 react according to the following chemical equation? 2P(s)+ 3I2(s) →\rarr→ 2PI3(s)

Calculate the mass of excess reagent remaining at the end of the reaction in which 90.0 g of SO2 are mixed with 100.0 g of O2. 2SO2 + O2 →\rarr→ 2SO3

What is the theoretical yield of PI3 from the reaction of 27.0 g of P and 68.0 g of I2? 2P(s)+ 3I2(s) →\rarr→ 2PI3(s)

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

Balance the following chemical equation: C + Fe₂O₃ $\rarr$ Fe + CO

How many sulfur atoms are present in 25.6 g of Al₂(S₂O₃)₃?

What is the mass of 3.00 moles of ethanol, C₂H₆O?

Calculate the molecular mass of potassium permanganate, KMnO₄.

Calculate the molecular mass, in g/mol, of H₂SO₄.

Balance the following chemical equation: NH₃ + H₂SO₄ $\rarr$ (NH₄)₂SO₄

Balance the following chemical equation: NaNO₃ $\rarr$ NaNO₂ + O₂

When a 0.952 g sample of an organic compound containing C, H, and O is burned completely in oxygen, 1.35 g of CO₂ and 0.826 g of H₂O are produced. What is the empirical formula of the compound?

How many sulfur atoms are there in 21.0 g of Al₂S₃?

How many carbon atoms are there in 10 lbs of sugar, C₁₂H₂₂O₁₁?

Ammonia reacts with diatomic oxygen to form nitric oxide and water vapor: 4NH₃ + 5O₂ $\rarr$ 4NO + 6H₂O When 20.0 g NH₃ and 50.0 g O₂ are allowed to react, which is the limiting reagent?

How many moles of CF₄ are there in 171 g of CF₄?

Balance the following chemical equation: P₄O₁₀ + H₂O $\rarr$ H₃PO₄

What is the limiting reagent when 27.0 g of P and 68.0 g of I₂ react according to the following chemical equation? 2P(s)+ 3I₂(s) $\rarr$ 2PI₃(s)

Calculate the mass of excess reagent remaining at the end of the reaction in which 90.0 g of SO₂ are mixed with 100.0 g of O₂. 2SO₂ + O₂ $\rarr$ 2SO₃

What is the theoretical yield of PI₃ from the reaction of 27.0 g of P and 68.0 g of I₂? 2P(s)+ 3I₂(s) $\rarr$ 2PI₃(s)