Use the table below to answer the questions that follow. Thermodynamic Quantities for Selected Substances at 298.15 K (25 °C) Substance ΔH°f (kJ/mol)ΔG°f (kJ/mol)S (J/K-mol) Carbon C (s, diamond)1.88 2.84 2.43 C (s, graphite)0 0 5.69 CS1U1B12S1U1B0HS1U1B12S1U1B0 (g)226.7 209.2 200.8 CS1U1B12S1U1B0HS1U1B14S1U1B0 (g)52.30 68.11 219.4 CS1U1B12S1U1B0HS1U1B16S1U1B0 (g)-84.68 -32.89 229.5 CO (g)-110.5 -137.2 197.9 COS1U1B12S1U1B0 (g)-393.5 -394.4 213.6 Hydrogen HS1U1B12S1U1B0( g)0 0 130.58 Oxygen OS1U1B12S1U1B0 (g)0 0 205.0 HS1U1B12S1U1B0O (l)-285.83 -237.13 69.91 -The value of ΔS° for the oxidation of carbon to carbon monoxide, 2C (s, graphite) + O2 (g) → 2CO (g) Is ________ J/K ∙ mol. Carbon monoxide is produced in the combustion of carbon with limited oxygen.

A) -12.8 B) +408.6 C) -408.6 D) +179.4 E) +395.8 A) -12.8 B) +408.6 C) -408.6 D) +179.4 E) +395.8

The value of ΔH° for the formation of POCl3 from its constituent elements, P2 (g) + O2 (g) + 3Cl2 (g) → 2POCl3 (g) Is ________ kJ/mol.

A) -1228.7 B) -397.7 C) -686.5 D) +1228.7 E) +686.5 A) -1228.7 B) -397.7 C) -686.5 D) +1228.7 E) +686.5

The combustion of hydrogen in the presence of excess oxygen yields water: 2H2(g) + O2(g) → 2H2O (l) The value of ΔS° for this reaction is ________ J/K ∙ mol.

A) +405.5 B) -405.5 C) -326.3 D) -265.7 E) +265.7 A) +405.5 B) -405.5 C) -326.3 D) -265.7 E) +265.7

The value of ΔG° at 25 °C for the formation of POCl3 from its constituent elements, P2 (g) + O2 (g) + 3Cl2 (g) → 2POCl3 (g) Is ________ kJ/mol.

A) -1108.7 B) +1108.7 C) -606.2 D) +606.2 E) -1,005 A) -1108.7 B) +1108.7 C) -606.2 D) +606.2 E) -1,005

The value of ΔG° at 25 °C for the decomposition of POCl3 into its constituent elements, 2POCl3 (g) → P2 (g) + O2 (g) + 3Cl2 (g) Is ________ kJ/mol.

A) -1108.7 B) +1108.7 C) -606.2 D) +606.2 E) -1,005 A) -1108.7 B) +1108.7 C) -606.2 D) +606.2 E) -1,005

Use the table below to answer the questions that follow. Thermodynamic Quantities for Selected Substances at 298.15 K (25 °C) Substance ΔH°f (kJ/mol)ΔG°f (kJ/mol)S (J/K-mol) Carbon C (s, diamond)1.88 2.84 2.43 C (s, graphite)0 0 5.69 CS1U1B12S1U1B0HS1U1B12S1U1B0 (g)226.7 209.2 200.8 CS1U1B12S1U1B0HS1U1B14S1U1B0 (g)52.30 68.11 219.4 CS1U1B12S1U1B0HS1U1B16S1U1B0 (g)-84.68 -32.89 229.5 CO (g)-110.5 -137.2 197.9 COS1U1B12S1U1B0 (g)-393.5 -394.4 213.6 Hydrogen HS1U1B12S1U1B0( g)0 0 130.58 Oxygen OS1U1B12S1U1B0 (g)0 0 205.0 HS1U1B12S1U1B0O (l)-285.83 -237.13 69.91 -The value of ΔS° for the catalytic hydrogenation of acetylene to ethene, C2H2 (g) + H2 (g) → C2H4 (g) Is ________ J/K∙ mol.

A) +18.6 B) +550.8 C) +112.0 D) -112.0 E) -18.6 A) +18.6 B) +550.8 C) +112.0 D) -112.0 E) -18.6

Exam 19: Chemical Thermodynamics

The value of ΔS° for the decomposition of gaseous sulfur trioxide to solid elemental sulfur and gaseous oxygen, 2SO₃ (g) → 2S (s, rhombic) + 3O₂ (g) Is ________ J/K ∙ mol.

(Multiple Choice)

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Question 21

Use the table below to answer the questions that follow. Thermodynamic Quantities for Selected Substances at 298.15 K (25 °C) Substance ΔH°f (kJ/mol)ΔG°f (kJ/mol)S (J/K-mol) Carbon C (s, diamond)1.88 2.84 2.43 C (s, graphite)0 0 5.69 C₂H₂ (g)226.7 209.2 200.8 C₂H₄ (g)52.30 68.11 219.4 C₂H₆ (g)-84.68 -32.89 229.5 CO (g)-110.5 -137.2 197.9 CO₂ (g)-393.5 -394.4 213.6 Hydrogen H₂( g)0 0 130.58 Oxygen O₂ (g)0 0 205.0 H₂O (l)-285.83 -237.13 69.91 -The value of ΔS° for the oxidation of carbon to carbon monoxide, 2C (s, graphite) + O₂ (g) → 2CO (g) Is ________ J/K ∙ mol. Carbon monoxide is produced in the combustion of carbon with limited oxygen.

(Multiple Choice)

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Question 22

ΔS is positive for the reaction ________.

(Multiple Choice)

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Question 23

The value of ΔS° for the decomposition of phosphorous trichloride into its constituent elements, 2PCl₃(g) → P₂(g) + 3Cl₂( g) Is ________ J/K ∙ mol.

(Multiple Choice)

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Question 24

The equilibrium constant for a reaction is 0.38 at 25 °C. What is the value of ΔG° (kJ/mol)at this temperature?

(Multiple Choice)

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Question 25

If ΔG° for a reaction is less than zero, then ________.

(Multiple Choice)

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Question 26

For a given reaction with ΔS = -50.8 J/K-mol, the ΔG = 0 at 395 K. The value of ΔH must be ________ kJ/mol, assuming that ΔH and ΔS do not vary with temperature.

(Multiple Choice)

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Question 27

The value of ΔH° for the formation of POCl₃ from its constituent elements, P₂ (g) + O₂ (g) + 3Cl₂ (g) → 2POCl₃ (g) Is ________ kJ/mol.

(Multiple Choice)

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Question 28

The value of ΔS° for the formation of calcium chloride from its constituent elements, Ca (s) + Cl₂ (g) → CaCl₂(s) Is ________ J/K ∙ mol.

(Multiple Choice)

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Question 29

The value of ΔG° at 25 °C for the decomposition of phosphorous trichloride into its constituent elements, 2PCl₃ (g) → P₂ (g) + 3Cl₂ (g) Is ________ kJ/mol.

(Multiple Choice)

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Question 30

The combustion of hydrogen in the presence of excess oxygen yields water: 2H₂(g) + O₂(g) → 2H₂O (l) The value of ΔS° for this reaction is ________ J/K ∙ mol.

(Multiple Choice)

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Question 31

Of the following, the entropy of gaseous ________ is the largest at 25 °C and 1 atm.

(Multiple Choice)

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Question 32

The value of ΔG° at 25 °C for the formation of POCl₃ from its constituent elements, P₂ (g) + O₂ (g) + 3Cl₂ (g) → 2POCl₃ (g) Is ________ kJ/mol.

(Multiple Choice)

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Question 33

The value of ΔG° at 25 °C for the oxidation of solid elemental sulfur to gaseous sulfur trioxide, 2S (s, rhombic) + 3O₂ (g) → 2SO₃ (g) Is ________ kJ/mol.

(Multiple Choice)

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Question 34

The entropy of the universe is ________.

(Multiple Choice)

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Question 35

The value of ΔG° at 25 °C for the decomposition of POCl₃ into its constituent elements, 2POCl₃ (g) → P₂ (g) + O₂ (g) + 3Cl₂ (g) Is ________ kJ/mol.

(Multiple Choice)

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Question 36

Use the table below to answer the questions that follow. Thermodynamic Quantities for Selected Substances at 298.15 K (25 °C) Substance ΔH°f (kJ/mol)ΔG°f (kJ/mol)S (J/K-mol) Carbon C (s, diamond)1.88 2.84 2.43 C (s, graphite)0 0 5.69 C₂H₂ (g)226.7 209.2 200.8 C₂H₄ (g)52.30 68.11 219.4 C₂H₆ (g)-84.68 -32.89 229.5 CO (g)-110.5 -137.2 197.9 CO₂ (g)-393.5 -394.4 213.6 Hydrogen H₂( g)0 0 130.58 Oxygen O₂ (g)0 0 205.0 H₂O (l)-285.83 -237.13 69.91 -The value of ΔS° for the catalytic hydrogenation of acetylene to ethene, C₂H₂ (g) + H₂ (g) → C₂H₄ (g) Is ________ J/K∙ mol.

(Multiple Choice)

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Question 37

Which one of the following statements is true about the equilibrium constant for a reaction if ΔG° for the reaction is negative?

(Multiple Choice)

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Question 38

The value of ΔG° for a reaction conducted at 25 °C is 2.8 kJ/mol. The equilibrium constant for a reaction is ________ at this temperature.

(Multiple Choice)

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Question 39

ΔS is negative for the reaction ________.

(Multiple Choice)

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Question 40

Showing 21 - 40 of 125

Exam 19: Chemical Thermodynamics

The value of ΔS° for the decomposition of gaseous sulfur trioxide to solid elemental sulfur and gaseous oxygen, 2SO3 (g) → 2S (s, rhombic) + 3O2 (g) Is ________ J/K ∙ mol.

ΔS is positive for the reaction ________.

The value of ΔS° for the decomposition of phosphorous trichloride into its constituent elements, 2PCl3 (g) → P2 (g) + 3Cl2( g) Is ________ J/K ∙ mol.

The equilibrium constant for a reaction is 0.38 at 25 °C. What is the value of ΔG° (kJ/mol)at this temperature?

If ΔG° for a reaction is less than zero, then ________.

For a given reaction with ΔS = -50.8 J/K-mol, the ΔG = 0 at 395 K. The value of ΔH must be ________ kJ/mol, assuming that ΔH and ΔS do not vary with temperature.

The value of ΔH° for the formation of POCl3 from its constituent elements, P2 (g) + O2 (g) + 3Cl2 (g) → 2POCl3 (g) Is ________ kJ/mol.

The value of ΔS° for the formation of calcium chloride from its constituent elements, Ca (s) + Cl2 (g) → CaCl2 (s) Is ________ J/K ∙ mol.

The value of ΔG° at 25 °C for the decomposition of phosphorous trichloride into its constituent elements, 2PCl3 (g) → P2 (g) + 3Cl2 (g) Is ________ kJ/mol.

The combustion of hydrogen in the presence of excess oxygen yields water: 2H2(g) + O2(g) → 2H2O (l) The value of ΔS° for this reaction is ________ J/K ∙ mol.

Of the following, the entropy of gaseous ________ is the largest at 25 °C and 1 atm.

The value of ΔG° at 25 °C for the formation of POCl3 from its constituent elements, P2 (g) + O2 (g) + 3Cl2 (g) → 2POCl3 (g) Is ________ kJ/mol.

The value of ΔG° at 25 °C for the oxidation of solid elemental sulfur to gaseous sulfur trioxide, 2S (s, rhombic) + 3O2 (g) → 2SO3 (g) Is ________ kJ/mol.

The entropy of the universe is ________.

The value of ΔG° at 25 °C for the decomposition of POCl3 into its constituent elements, 2POCl3 (g) → P2 (g) + O2 (g) + 3Cl2 (g) Is ________ kJ/mol.

Which one of the following statements is true about the equilibrium constant for a reaction if ΔG° for the reaction is negative?

The value of ΔG° for a reaction conducted at 25 °C is 2.8 kJ/mol. The equilibrium constant for a reaction is ________ at this temperature.

ΔS is negative for the reaction ________.

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The value of ΔS° for the decomposition of gaseous sulfur trioxide to solid elemental sulfur and gaseous oxygen, 2SO₃ (g) → 2S (s, rhombic) + 3O₂ (g) Is ________ J/K ∙ mol.

The value of ΔS° for the decomposition of phosphorous trichloride into its constituent elements, 2PCl₃(g) → P₂(g) + 3Cl₂( g) Is ________ J/K ∙ mol.

The value of ΔH° for the formation of POCl₃ from its constituent elements, P₂ (g) + O₂ (g) + 3Cl₂ (g) → 2POCl₃ (g) Is ________ kJ/mol.

The value of ΔS° for the formation of calcium chloride from its constituent elements, Ca (s) + Cl₂ (g) → CaCl₂(s) Is ________ J/K ∙ mol.

The value of ΔG° at 25 °C for the decomposition of phosphorous trichloride into its constituent elements, 2PCl₃ (g) → P₂ (g) + 3Cl₂ (g) Is ________ kJ/mol.

The combustion of hydrogen in the presence of excess oxygen yields water: 2H₂(g) + O₂(g) → 2H₂O (l) The value of ΔS° for this reaction is ________ J/K ∙ mol.

The value of ΔG° at 25 °C for the formation of POCl₃ from its constituent elements, P₂ (g) + O₂ (g) + 3Cl₂ (g) → 2POCl₃ (g) Is ________ kJ/mol.

The value of ΔG° at 25 °C for the oxidation of solid elemental sulfur to gaseous sulfur trioxide, 2S (s, rhombic) + 3O₂ (g) → 2SO₃ (g) Is ________ kJ/mol.

The value of ΔG° at 25 °C for the decomposition of POCl₃ into its constituent elements, 2POCl₃ (g) → P₂ (g) + O₂ (g) + 3Cl₂ (g) Is ________ kJ/mol.