Exam 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 373 °K for the oxidation of solid elemental sulfur to gaseous sulfur dioxide, is kJ/mol. At 298K, OH° for this reaction is - 269.9 kJ/mol, and OS° is +11.6 J/K.

In the Haber process, ammonia is synthesized from nitrogen and hydrogen: ΔG° at 298 ^oK for this reaction is - 33.3 kJ/mol. The value of ΔG at 298 K for a reaction mixture that consists of 1.9 atm N₂, 1.6 atm H₂, and 0.65 atm NH₃ is _ .

Use the table below to answer the questions that follow. Thermodynamic Quantities for Selected Substances at 298.15 K (25°C) -The combustion of hydrogen in the presence of excess oxygen yields water: The value of OS^o for this reaction is J/K.

OS is positive for the reaction _.

Use the table below to answer the questions that follow. Thermodynamic Quantities for Selected Substances at 298.15 K (25°C) -Consider the reaction: Given the following table of thermodynamic data at 298 ^oK: The value of K for the reaction at 25 °C is .

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 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 phosphorous trichloride 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 equilibrium constant for a reaction is 0.48 at 25 °C. What is the value of ΔG° (kJ/mol) at this temperature?

The first law of thermodynamics can be given as .

Use the table below to answer the questions that follow. Thermodynamic Quantities for Selected Substances at 298.15 K (25°C) -Consider the reaction: Given the following table of thermodynamic data at 298 ^oK: The value of K for the reaction at 25 °C is .

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 decomposition of calcium chloride into its constituent elements, is J/K.

ΔS is negative for the reaction .

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.

Given the following table of thermodynamic data, Complete the following sentence. The vaporization of PCl₃ (l) is .

The entropy of the universe is .

OS is positive for the reaction _.

Use the table below to answer the questions that follow. Thermodynamic Quantities for Selected Substances at 298.15 K (25°C) -The value of OH° for the formation of phosphorous trichloride 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 ΔG° at 25 °C for the decomposition of POCl₃ into 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 gaseous sulfur dioxide to solid elemental sulfur and gaseous oxygen, is kJ/mol.