Question 1

Use the table below to answer the questions that follow.
Thermodynamic Quantities for Selected Substances at 298.15 K (25°C) 
-The value of ΔG°at 25 °C for the decomposition of phosphorous trichloride into its constituent elements,  is kJ/mol.

Accepted Answer

The answer of Use the table below to answer the...

Question 2

Find the temperature above which a reaction with a OH of 53 .00 kJ/mol and a OS of 100.0 J/K·mol becomes spontaneous.

Accepted Answer

The answer of Find the temperature above which a reaction...

Question 3

Use the table below to answer the questions that follow. Thermodynamic Quantities for Selected Substances at 298.15 K (25°C) - The combustion of acetylene in the presence of excess oxygen yields carbon dioxide The value of ΔS^ofor this reaction is J/K.

Accepted Answer

The answer of Use the table below to answer the...

Question 4

Use the table below to answer the questions that follow.
Thermodynamic Quantities for Selected Substances at 298.15 K (25°C) 
-The value of ΔH° for the decomposition of phosphorous trichloride into its constituent elements,  is kJ/mol.

Accepted Answer

The answer of Use the table below to answer the...

Question 5

Calculate OG^○(in kJ/mol) for the following reaction at 1 atm and 25^○C: OH_f^○C₂H₆(g) = - 84.7 kJ/mol; S^○C₂H₆(g) = 229.5 J/K · mol; OH_f^○CO₂(g) = - 393.5 kJ/mol; S^○CO₂(g) = 213.6 J/K · mol; OH_f^○H₂O (l) = - 285.8 kJ/mol; S^○H₂O (l) = 69.9 J/K · mol

Accepted Answer

The answer of Calculate OG^○(in kJ/mol) for the following reaction...

Question 6

Use the table below to answer the questions that follow.
Thermodynamic Quantities for Selected Substances at 298.15 K (25°C) 
-The value of ΔH° for the oxidation of solid elemental sulfur to gaseous sulfur trioxide,  is kJ/mol.

Accepted Answer

In the table, the value for ΔH°f for elemental sulfur is 0 and the value for ΔH°f for sulfur trioxide is -396.5. The ΔH° for the reaction can be calculated as follows: ΔH° = Σ ΔH°f (products) - Σ ΔH°f (reactants) = (-396.5 kJ/mol) - 0 kJ/mol = -396.5 kJ/mol. However, the question asks for the value of ΔH° for the reverse reaction (oxidation of solid elemental sulfur to gaseous sulfur trioxide). This means that the sign of ΔH° should be flipped, giving a final value of +790.4 kJ/mol. Therefore, the best choice is C.

Question 7

Use the table below to answer the questions that follow. Thermodynamic Quantities for Selected Substances at 298.15 K (25°C) -The value of ΔG° at 25 °C for the formation of POCl₃from its constituent elements, is kJ/mol.

Accepted Answer

The answer of Use the table below to answer the...

Question 8

Use the table below to answer the questions that follow. Thermodynamic Quantities for Selected Substances at 298.15 K (25°C) -The value of ΔH° for the decomposition of POCl₃into its constituent elements, is kJ/mol.

Accepted Answer

The answer of Use the table below to answer the...

Question 9

Calculate OG^o(in kJ/mol) for the following reaction at 1 atm and 25^○C: OG_f^○C₂H₆(g) = - 32.89 kJ/mol; OG_f^○CO₂(g) = - 394.4 kJ/mol; OG_f^○H₂O (l) = - 237.2 kJ/mol

Accepted Answer

The answer of Calculate OG^o(in kJ/mol) for the following...

Question 10

Use the table below to answer the questions that follow.
Thermodynamic Quantities for Selected Substances at 298.15 K (25°C) 
-The value of ΔS° for the formation of phosphorous trichloride from its constituent elements,  is J/K.

Accepted Answer

The answer of Use the table below to answer the...

Question 11

For the reaction  ΔH° = 131.3 kJ/mol andΔS° = 133.6 J/K · mol at 298 K. At temperatures greater than _°C this reaction is spontaneous under standard conditions.

Accepted Answer

The answer of For the reaction  ΔH° = 131.3...

Question 12

Use the table below to answer the questions that follow.
Thermodynamic Quantities for Selected Substances at 298.15 K (25°C) 
-The value of ΔS° for the oxidation of solid elemental sulfur to gaseous sulfur trioxide,  is J/K.

Accepted Answer

The answer of Use the table below to answer the...

Question 13

Consider a pure crystalline solid that is heated from absolute zero to a temperature above the boiling point of the liquid. Which of the following processes produces the greatest increase in the entropy of the substance?

Accepted Answer

Vaporizing the liquid involves a phase change from liquid to gas, which significantly increases the entropy due to the large increase in molecular disorder and freedom of movement compared to the other processes.

Question 14

Consider the reaction:

Given the following table of thermodynamic data, 
Determine the temperature (in °C) above which the reaction is nonspontaneous under standard conditions.

Accepted Answer

The answer of Consider the reaction:

Given the following table of...

Question 15

Use the table below to answer the questions that follow.
Thermodynamic Quantities for Selected Substances at 298.15 K (25°C) 
-The value of ΔH° for the oxidation of solid elemental sulfur to gaseous sulfur dioxide,  is kJ/mol.

Accepted Answer

The answer of Use the table below to answer the...

Question 16

Calculate OG^○for the autoionization of water at 25^○C. K_w= 1.0 × 10^-¹⁴

Accepted Answer

The answer of Calculate OG^○for the autoionization of water at...

Question 17

Use the table below to answer the questions that follow. Thermodynamic Quantities for Selected Substances at 298.15 K (25°C) -The value of ΔH° for the formation of POCl₃from its constituent elements, is kJ/mol.

Accepted Answer

The answer of Use the table below to answer the...

Question 18

Which one of the following processes produces a decrease of the entropy of the system?

Accepted Answer

Dissolving oxygen in water decreases the entropy of the system because the gas molecules become more ordered when they are dissolved in the liquid, reducing the overall randomness.

Question 19

Consider the reaction:

Given the following table of thermodynamic data, 
Determine the temperature (in °C) above which the reaction is nonspontaneous.

Accepted Answer

The answer of Consider the reaction:

Given the following table of...

Question 20

Find the temperature above which a reaction with a OH of 123 .0 kJ/mol and a OS of 90.00 J/K·mol becomes spontaneous.

Accepted Answer

The answer of Find the temperature above which a reaction...

Quiz 19: Chemical Thermodynamics

Use the table below to answer the questions that follow. Thermodynamic Quantities for Selected Substances at 298.15 K (25°C) -The value of ΔG°at 25 °C for the decomposition of phosphorous trichloride into its constituent elements, is kJ/mol.

Find the temperature above which a reaction with a OH of 53 .00 kJ/mol and a OS of 100.0 J/K·mol becomes spontaneous.

Use the table below to answer the questions that follow. Thermodynamic Quantities for Selected Substances at 298.15 K (25°C) - The combustion of acetylene in the presence of excess oxygen yields carbon dioxide The value of ΔSo for this reaction is J/K.

Use the table below to answer the questions that follow. Thermodynamic Quantities for Selected Substances at 298.15 K (25°C) -The value of ΔH° for the decomposition of phosphorous trichloride into its constituent elements, is kJ/mol.

Calculate OG○(in kJ/mol) for the following reaction at 1 atm and 25○C: OHf○C2H6 (g) = - 84.7 kJ/mol; S○C2H6 (g) = 229.5 J/K · mol; OHf○CO2 (g) = - 393.5 kJ/mol; S○CO2 (g) = 213.6 J/K · mol; OHf○H2O (l) = - 285.8 kJ/mol; S○H2O (l) = 69.9 J/K · mol

Use the table below to answer the questions that follow. Thermodynamic Quantities for Selected Substances at 298.15 K (25°C) -The value of ΔH° for the oxidation of solid elemental sulfur to gaseous sulfur trioxide, is kJ/mol.

Use the table below to answer the questions that follow. Thermodynamic Quantities for Selected Substances at 298.15 K (25°C) -The value of ΔG° at 25 °C for the formation of POCl3 from its constituent elements, is kJ/mol.

Use the table below to answer the questions that follow. Thermodynamic Quantities for Selected Substances at 298.15 K (25°C) -The value of ΔH° for the decomposition of POCl3 into its constituent elements, is kJ/mol.

Calculate OGo (in kJ/mol) for the following reaction at 1 atm and 25○C: OGf○C2H6 (g) = - 32.89 kJ/mol; OGf○CO2 (g) = - 394.4 kJ/mol; OGf○H2O (l) = - 237.2 kJ/mol

Use the table below to answer the questions that follow. Thermodynamic Quantities for Selected Substances at 298.15 K (25°C) -The value of ΔS° for the formation of phosphorous trichloride from its constituent elements, is J/K.

For the reaction ΔH° = 131.3 kJ/mol andΔS° = 133.6 J/K · mol at 298 K. At temperatures greater than _°C this reaction is spontaneous under standard conditions.

Use the table below to answer the questions that follow. Thermodynamic Quantities for Selected Substances at 298.15 K (25°C) -The value of ΔS° for the oxidation of solid elemental sulfur to gaseous sulfur trioxide, is J/K.

Consider a pure crystalline solid that is heated from absolute zero to a temperature above the boiling point of the liquid. Which of the following processes produces the greatest increase in the entropy of the substance?

Consider the reaction: Given the following table of thermodynamic data, Determine the temperature (in °C) above which the reaction is nonspontaneous under standard conditions.

Use the table below to answer the questions that follow. Thermodynamic Quantities for Selected Substances at 298.15 K (25°C) -The value of ΔH° for the oxidation of solid elemental sulfur to gaseous sulfur dioxide, is kJ/mol.

Calculate OG○for the autoionization of water at 25○C. Kw = 1.0 × 10- 14

Use the table below to answer the questions that follow. Thermodynamic Quantities for Selected Substances at 298.15 K (25°C) -The value of ΔH° for the formation of POCl3 from its constituent elements, is kJ/mol.

Which one of the following processes produces a decrease of the entropy of the system?

Consider the reaction: Given the following table of thermodynamic data, Determine the temperature (in °C) above which the reaction is nonspontaneous.

Find the temperature above which a reaction with a OH of 123 .0 kJ/mol and a OS of 90.00 J/K·mol becomes spontaneous.

Use the table below to answer the questions that follow. Thermodynamic Quantities for Selected Substances at 298.15 K (25°C) - The combustion of acetylene in the presence of excess oxygen yields carbon dioxide The value of ΔS^ofor this reaction is J/K.

Calculate OG^○(in kJ/mol) for the following reaction at 1 atm and 25^○C: OH_f^○C₂H₆(g) = - 84.7 kJ/mol; S^○C₂H₆(g) = 229.5 J/K · mol; OH_f^○CO₂(g) = - 393.5 kJ/mol; S^○CO₂(g) = 213.6 J/K · mol; OH_f^○H₂O (l) = - 285.8 kJ/mol; S^○H₂O (l) = 69.9 J/K · mol

Use the table below to answer the questions that follow. Thermodynamic Quantities for Selected Substances at 298.15 K (25°C) -The value of ΔG° at 25 °C for the formation of POCl₃from its constituent elements, is kJ/mol.

Use the table below to answer the questions that follow. Thermodynamic Quantities for Selected Substances at 298.15 K (25°C) -The value of ΔH° for the decomposition of POCl₃into its constituent elements, is kJ/mol.

Calculate OG^o(in kJ/mol) for the following reaction at 1 atm and 25^○C: OG_f^○C₂H₆(g) = - 32.89 kJ/mol; OG_f^○CO₂(g) = - 394.4 kJ/mol; OG_f^○H₂O (l) = - 237.2 kJ/mol

Calculate OG^○for the autoionization of water at 25^○C. K_w= 1.0 × 10^-¹⁴

Use the table below to answer the questions that follow. Thermodynamic Quantities for Selected Substances at 298.15 K (25°C) -The value of ΔH° for the formation of POCl₃from its constituent elements, is kJ/mol.