2 Na₂O(s) + O₂(g) → 2 Na₂O₂(s)
For the reaction represented above, the value of ΔG₂₉₈° is -144 kJ/mol rxn. The standard free energy of formation of Na₂O(s) at 298 K is -376 kJ/mol. What is the standard free energy of formation of Na₂O₂(s) at 298 K?