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 25 °C for the decomposition of calcium chloride into its constituent elements, is kJ/mol.

For a reaction to be spontaneous under standard conditions at all temperatures, the signs of ΔH° and ΔS° must be _ _ and , respectively.

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 calcium chloride 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 gaseous sulfur trioxide to its component elements, is kJ/mol.

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

A reaction that is spontaneous as written .

Of the following, the entropy of is the largest.

For the reaction ΔH° is +137 kJ/mol and ΔS° is +120 J/K · mol. This reaction 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 ethene in the presence of excess oxygen yields carbon dioxide and water: The value of OS^o 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 ΔS° for the reaction 2C (s, diamond) + O₂ (g) - 2CO (g) 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 ΔS° for the oxidation of solid elemental sulfur to gaseous sulfur dioxide, 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 ΔS° for the catalytic hydrogenation of acetylene 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 formation of calcium chloride 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 OS° for the formation of POCl₃ from its constituent elements, 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 ΔS° for the formation of phosphorous trichloride from its constituent elements, 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 ΔS° for the formation of calcium chloride from its constituent elements, is J/K.

A common name for methanol (CH₃OH) is wood alcohol. The normal boiling point of methanol is 64.7 °C and the molar enthalpy of vaporization if 71.8 kJ/mol. The value of ΔS when 2.15 mol of CH₃OH (l) vaporizes at 64.7 °C 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 ΔS° for the oxidation of carbon to carbon Is J/K. The combustion of carbon, as in charcoal briquettes, in the presence of abundant oxygen produces carbon dioxide.

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.

The standard Gibbs free energy of formation of is zero. (a) H₂O (l) (b) Na (s) (c) H₂ (g)