The standard Gibbs energies of formation, f G, for KO 2 (s) and K 2 O(s)

The standard Gibbs energies of formation, Δ_fG°, for KO₂(s) and K₂O(s) are -240.59 kJ mol‾¹ and -322.09 kJ mol‾¹, respectively, at 298 K. Calculate the equilibrium constant for the reaction below at 298 K. Is KO₂(s) thermodynamically stable with respect to K₂O(s) and O₂(g) at 298 K?

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2 KO₂ (s) 3 K₂O(s) + -O₂(g) 2