Free Energy of Dissolution Practice Test

A molecular solid dissolves in water: $\text{A}(s) \rightarrow \text{A}(aq)$. The dissolution is observed to cool the solution, so $\Delta H_{\text{soln}}>0$, and the ordering of water around A causes $\Delta S_{\text{soln}}<0$. At which temperatures, if any, is dissolution thermodynamically favored?

A salt dissolves in water according to: $\text{MX}(s) \rightarrow \text{M}^+(aq)+\text{X}^-(aq)$. For this dissolution, $\Delta H_{\text{soln}}<0$ and $\Delta S_{\text{soln}}>0$. Under which conditions is the dissolution thermodynamically favored (i.e., $\Delta G<0$)?