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Activity: Absolute standard entropy values for N2O4 (g) and NO2(g) are 304 J K?¹mol?¹ and 240 J K?¹mol?¹, respectively. Calculate the total standard enthalpy change (system + surroundings) and determine whether the reaction is spontaneous at 25 °C. How will increasing the temperature to 100 °C affect the spontaneity of this reaction? Give the results of all your calculations correct to the nearest whole numbers. N2O4(g) ? 2NO2(g) ?H°rxn = +57 kJ K?¹mol?¹ • standard entropy change for the system, ?S°sys = J K?¹mol?¹ • standard entropy change for the surroundings at 25 °C, ?S°surr = J K?¹mol?¹ • total entropy change for the system and the surroundings at 25 °C, ?S°total = J K?¹mol?¹ The reaction --- spontaneous at 25 °C. The reverse reaction --- spontaneous at this temperature. • standard entropy change for the surroundings at 100 °C, ?S°surr = J K?¹mol?¹ • total entropy change for the system and the surroundings at 100 °C, ?S°total = J K?¹mol?¹ The reaction --- spontaneous at 100 °C. The reverse reaction --- spontaneous at this temperature.

          Activity: Absolute standard entropy values for N2O4 (g) and NO2(g) are 304 J K?¹mol?¹ and 240 J K?¹mol?¹, respectively. Calculate the total standard enthalpy change (system + surroundings) and determine whether the reaction is spontaneous at 25 °C. How will increasing the temperature to 100 °C affect the spontaneity of this reaction? Give the results of all your calculations correct to the nearest whole numbers.

N2O4(g) ? 2NO2(g) ?H°rxn = +57 kJ K?¹mol?¹

• standard entropy change for the system,
?S°sys = J K?¹mol?¹
• standard entropy change for the surroundings at 25 °C,
?S°surr = J K?¹mol?¹
• total entropy change for the system and the surroundings at 25 °C,
?S°total = J K?¹mol?¹

The reaction --- spontaneous at 25 °C.
The reverse reaction --- spontaneous at this temperature.

• standard entropy change for the surroundings at 100 °C,
?S°surr = J K?¹mol?¹
• total entropy change for the system and the surroundings at 100 °C,
?S°total = J K?¹mol?¹

The reaction --- spontaneous at 100 °C.
The reverse reaction --- spontaneous at this temperature.

Activity: Absolute standard entropy values for N2O4 (g) and NO2(g) are 304 J K?¹mol?¹ and 240 J K?¹mol?¹, respectively. Calculate the total standard enthalpy change (system + surroundings) and determine whether the reaction is spontaneous at 25 °C. How will increasing the temperature to 100 °C affect the spontaneity of this reaction? Give the results of all your calculations correct to the nearest whole numbers.

N2O4(g) ? 2NO2(g) ?H°rxn = +57 kJ K?¹mol?¹

• standard entropy change for the system,
?S°sys = J K?¹mol?¹
• standard entropy change for the surroundings at 25 °C,
?S°surr = J K?¹mol?¹
• total entropy change for the system and the surroundings at 25 °C,
?S°total = J K?¹mol?¹

The reaction — spontaneous at 25 °C.
The reverse reaction — spontaneous at this temperature.

• standard entropy change for the surroundings at 100 °C,
?S°surr = J K?¹mol?¹
• total entropy change for the system and the surroundings at 100 °C,
?S°total = J K?¹mol?¹

The reaction — spontaneous at 100 °C.
The reverse reaction — spontaneous at this temperature.

Added by Cheyenne V.

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