Solution: Which of the following reactions will have the smallest equilibrium constant (K) at 298 K? A) CaCO3(s) → CaO(s) + CO2(g)                           ΔG° =+131.1 kJ B) Fe2O3(s) + 3 CO(g) → 2 Fe(s) + 3 CO2(g)          ΔG° = -28.0 kJ C) 3 O2(g) → 2 O3(g)                                             ΔG° = +326 kJ D) 2 Hg(g) + O2(g) → 2 HgO(s)                              ΔG° = -180.8 kJ E) It is not possible to determine without more information.

Problem

Which of the following reactions will have the smallest equilibrium constant (K) at 298 K?

A) CaCO3(s) → CaO(s) + CO2(g)                           ΔG° =+131.1 kJ
B) Fe2O3(s) + 3 CO(g) → 2 Fe(s) + 3 CO2(g)          ΔG° = -28.0 kJ
C) 3 O2(g) → 2 O3(g)                                             ΔG° = +326 kJ
D) 2 Hg(g) + O2(g) → 2 HgO(s)                              ΔG° = -180.8 kJ
E) It is not possible to determine without more information.