At what temperatures will a reaction be spontaneous if Δ_rH° = +117 kJ and Δ_rS° = -35 J/K? A) All temperatures below 94.1 K B) Temperatures between 12.7 K and 135 K C) All temperatures above 94.1 K D) The reaction will be spontaneous at any temperature. E) The reaction will never be spontaneous.

Question

Quizplus · Accepted Answer

A reaction is spontaneous when ΔG° < 0. Since ΔrH° is positive and ΔrS° is negative, ΔG° = ΔrH° - TΔrS° will always be positive, making the reaction non-spontaneous at any temperature.

At What Temperatures Will a Reaction Be Spontaneous If ΔrH°

At What Temperatures Will a Reaction Be Spontaneous If Δ_rH°