Question 1

Given the following table of thermodynamic data,    complete the following sentence.The vaporization of H2O2  (l)is ________.

Accepted Answer

A) nonspontaneous at low temperature and spontaneous at high temperature 
B) spontaneous at low temperature and nonspontaneous at high temperature 
C) spontaneous at all temperatures 
D) nonspontaneous at all temperatures 
E) not enough information given to draw a conclusion 
A) nonspontaneous at low temperature and spontaneous at high temperature 
B) spontaneous at low temperature and nonspontaneous at high temperature 
C) spontaneous at all temperatures 
D) nonspontaneous at all temperatures 
E) not enough information given to draw a conclusion

Question 2

The combustion of acetylene in the presence of excess oxygen yields carbon dioxide and water: 2C2H2 (g)+ 5O2 (g)→ 4CO2 (g)+ 2H2O (l)
The value of ΔS° for this reaction is ________ J/K ∙ mol.

Accepted Answer

A) +689.3 
B) +122.3 
C) +432.4 
D) -122.3 
E) -432.4 
A) +689.3 
B) +122.3 
C) +432.4 
D) -122.3 
E) -432.4

Question 3

At what temperature will a reaction be spontaneous? ΔH = +22.2 kJ/mol and ΔS = +81.1 J/K-mol and assume both do not vary with temperature.

Accepted Answer

A) at T > 298 K 
B) at T  274 K 
E) at all temperatures 
A) at T > 298 K 
B) at T  274 K 
E) at all temperatures

Question 4

For a given reaction with ΔH = -28.1 kJ/mol,the ΔG = 0 at   The value of ΔS must be   assuming that ΔH and ΔS do not vary with temperature.

Accepted Answer

A) -75.5 
B) 75.5 
C) -7.55 × 10-5 
D) 7.55 × 10-5 
E) -1.32 × 10-2 
A) -75.5 
B) 75.5 
C) -7.55 × 10-5 
D) 7.55 × 10-5 
E) -1.32 × 10-2

Question 5

The value of ΔS° for the decomposition of gaseous sulfur dioxide to solid elemental sulfur and gaseous oxygen, 
SO2 (g)→ S (s,rhombic)+ O2 (g)
Is ________ J/K ∙ mol.

Accepted Answer

A) +485.4 
B) +248.5 
C) -11.6 
D) -248.5 
E) +11.6 
A) +485.4 
B) +248.5 
C) -11.6 
D) -248.5 
E) +11.6

Given the following table of thermodynamic data, _{complete the following sentence.The vaporization of}H₂O₂ _{(l)is ________.}

The combustion of acetylene in the presence of excess oxygen yields carbon dioxide and water: 2C₂H₂ (g)+ 5O₂ (g)→ 4CO₂ (g)+ 2H₂O (l) The value of ΔS° for this reaction is ________ J/K ∙ mol.

At what temperature will a reaction be spontaneous? ΔH = +22.2 kJ/mol and ΔS = +81.1 J/K-mol and assume both do not vary with temperature.

For a given reaction with ΔH = -28.1 kJ/mol,the ΔG = 0 at The value of ΔS must be assuming that ΔH and ΔS do not vary with temperature.

The value of ΔS° for the decomposition of gaseous sulfur dioxide to solid elemental sulfur and gaseous oxygen, SO₂(g)→ S (s,rhombic)+ O₂(g) Is ________ J/K ∙ mol.

Introduction: Matter, energy, and Measurement

Atoms, molecules, and Ions

Chemical Reactions and Reaction Stoichiometry

Reactions in Aqueous Solution

Thermochemistry

Electronic Structure of Atoms

Periodic Properties of the Elements

Basic Concepts of Chemical Bonding

Molecular Geometry and Bonding Theories

Gases

Liquids and Intermolecular Forces

Solids and Modern Materials

Properties of Solutions

Chemical Kinetics

Chemical Equilibrium

Acid-Base Equilibria

Additional Aspects of Aqueous Equilibria

Chemistry of the Environment

Electrochemistry

Nuclear Chemistry

Chemistry of the Nonmetals

Transition Metals and Coordination Chemistry

The Chemistry of Life: Organic and Biological Chemistry

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Exam 19: Chemical Thermodynamics

Given the following table of thermodynamic data, complete the following sentence.The vaporization of H2O2 (l)is ________.

The combustion of acetylene in the presence of excess oxygen yields carbon dioxide and water: 2C2H2 (g)+ 5O2 (g)→ 4CO2 (g)+ 2H2O (l) The value of ΔS° for this reaction is ________ J/K ∙ mol.

At what temperature will a reaction be spontaneous? ΔH = +22.2 kJ/mol and ΔS = +81.1 J/K-mol and assume both do not vary with temperature.

For a given reaction with ΔH = -28.1 kJ/mol,the ΔG = 0 at The value of ΔS must be assuming that ΔH and ΔS do not vary with temperature.

The value of ΔS° for the decomposition of gaseous sulfur dioxide to solid elemental sulfur and gaseous oxygen, SO2 (g)→ S (s,rhombic)+ O2 (g) Is ________ J/K ∙ mol.

Introduction: Matter, energy, and Measurement

Atoms, molecules, and Ions

Chemical Reactions and Reaction Stoichiometry

Reactions in Aqueous Solution

Thermochemistry

Electronic Structure of Atoms

Periodic Properties of the Elements

Basic Concepts of Chemical Bonding

Molecular Geometry and Bonding Theories

Gases

Liquids and Intermolecular Forces

Solids and Modern Materials

Properties of Solutions

Chemical Kinetics

Chemical Equilibrium

Acid-Base Equilibria

Additional Aspects of Aqueous Equilibria

Chemistry of the Environment

Electrochemistry

Nuclear Chemistry

Chemistry of the Nonmetals

Transition Metals and Coordination Chemistry

The Chemistry of Life: Organic and Biological Chemistry

Filters

Given the following table of thermodynamic data, _{complete the following sentence.The vaporization of}H₂O₂ _{(l)is ________.}

The combustion of acetylene in the presence of excess oxygen yields carbon dioxide and water: 2C₂H₂ (g)+ 5O₂ (g)→ 4CO₂ (g)+ 2H₂O (l) The value of ΔS° for this reaction is ________ J/K ∙ mol.

The value of ΔS° for the decomposition of gaseous sulfur dioxide to solid elemental sulfur and gaseous oxygen, SO₂(g)→ S (s,rhombic)+ O₂(g) Is ________ J/K ∙ mol.