Which of the following combinations of signs for ΔH and ΔS will always result in a reaction being nonspontaneous?
A) ΔH+, ΔS-
B) ΔH-, ΔS+
C) ΔH-, ΔS-
D) ΔH+, ΔS+
E) cannot determine without temperature

Question

Quizplus · Accepted Answer

A positive ΔH means the reaction is endothermic and absorbs heat, which is not favorable for spontaneity. A negative ΔS means the system becomes more ordered, which is also not favorable for spontaneity. Therefore, the combination of ΔH+ and ΔS- will always result in a non-spontaneous reaction.

Which of the Following Combinations of Signs for ΔH and ΔS