Answer to Question #68044 in General Chemistry for Jennifer

Question

A reaction will be spontaneous at all temperatures if the reaction???

has a positive value for free energy change.
is exothermic and accompanied by an increase in disorder.
is endothermic and accompanied by a decrease in disorder.
is endothermic and accompanied by an increase of disorder.
is exothermic and accompanied by a decrease in disorder.

Answer 1

The given reaction will be spontaneous at any temperature if ΔG < 0. On the other hand, ΔG is equal to ΔH – TΔS. Thus, it must be always negative or, in other words, ΔH must be always negative (ΔH < 0, exothermic) and ΔS must be always positive (ΔS > 0, increase in disorder).
-is exothermic and accompanied by an increase in disorder.