Question

For the reaction PCl5 (g) → PCl3 (g) + Cl2 (g): ΔH°rxn = +92.5 kJ & ΔS°rxn = 182 J/K at 25°C. Is the reaction spontaneous at 25.0°C? At which temperature may spontaneity change? a. The reaction is spontaneous at 25°C. It becomes nonspontaneous above 235°C. b. The reaction is spontaneous at 25°C. It becomes nonspontaneous above 163°C. c. The reaction is nonspontaneous at 25°C. It becomes spontaneous above 235°C. d. The reaction is nonspontaneous at 25°C. It becomes spontaneous above 163°C.

          For the reaction PCl5 (g) → PCl3 (g) + Cl2 (g):
ΔH°rxn = +92.5 kJ & ΔS°rxn = 182 J/K at 25°C.
Is the reaction spontaneous at 25.0°C? At which temperature may spontaneity change?
a. The reaction is spontaneous at 25°C. It becomes nonspontaneous above 235°C.
b. The reaction is spontaneous at 25°C. It becomes nonspontaneous above 163°C.
c. The reaction is nonspontaneous at 25°C. It becomes spontaneous above 235°C.
d. The reaction is nonspontaneous at 25°C. It becomes spontaneous above 163°C.

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Added by Ana S.

Chemistry: Structure and Properties

Nivaldo Tro 2nd Edition

Instant Answer

Solved by Expert Susan Hallstrom

01/22/2023

Step 1

To determine if the reaction is spontaneous at 25°C, we use the Gibbs free energy equation: ΔG° = ΔH° - TΔS°. It's important to note that the temperature (T) should be in Kelvin. Therefore, first convert 25°C to Kelvin: 25°C + 273.15 = 298.15 K. Show more…

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For the reaction PCl5 (g) → PCl3 (g) + Cl2 (g): ΔH°rxn = +92.5 kJ & ΔS°rxn = 182 J/K at 25°C. Is the reaction spontaneous at 25.0°C? At which temperature may spontaneity change? a. The reaction is spontaneous at 25°C. It becomes nonspontaneous above 235°C. b. The reaction is spontaneous at 25°C. It becomes nonspontaneous above 163°C. c. The reaction is nonspontaneous at 25°C. It becomes spontaneous above 235°C. d. The reaction is nonspontaneous at 25°C. It becomes spontaneous above 163°C.

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