Answer to Question #59402 in General Chemistry for Cassie

Question

True or False? An exothermic reaction will always be spontaneous if the entropy increases.

Answer 1

Spontaneous reactions have a ΔG <0 and that ΔG = H - TΔS (Δ= delta).
So, an exothermic reaction that increases in entropy will always be spontaneous. But one which has a negative entropy change will be spontaneous at lower temperatures but not spontaneous at higher temperatures.