Consider the reaction 2Hg(l) + O₂(g) → 2HgO(s), for which ∆H°= -181.7 kJmol and ∆S°= -216.5 JmolK. Which of the following statements regarding its temperature dependence is true?
a) The reaction is endothermic.
b) The reaction is spontaneous at all temperatures.
c) The reaction is exothermic at all temperatures.
d) The reaction is exothermic at low temperatures and endothermic at high temperatures.