For a chemical reaction to be spontaneous at all temperatures, which of the following conditions must be met?

Question

Quizplus · Accepted Answer

For a chemical reaction to be spontaneous at all temperatures, the Gibbs free energy change (ΔG°) must be negative at all temperatures. This condition can be expressed as ΔG° = ΔH° - TΔS° < 0. To ensure that ΔG° is negative at all temperatures, the entropy change (ΔS°) must be positive (since temperature is always positive) and the enthalpy change (ΔH°) must be negative. Therefore, the correct choice is B.

For a Chemical Reaction to Be Spontaneous at All Temperatures