Estimate ΔG°_rxn for the Following Reaction at 825 K

Estimate ΔG°_rxn for the following reaction at 825 K. 2 Hg(g) + O₂(g) → 2 HgO(s) ΔH°= -304.2 kJ; ΔS°= -414.2 J/K

A) -2.63 kJ
B) -37 kJ
C) +37 kJ
D) +645 kJ
E) -645 kJ