Consider the following thermodynamic data for oxides of manganese.

(a) What is the correct chemical nomenclature for each of the first three oxides? 

(b) Write and balance chemical equations for the conversion of each of these oxides into Mn₃O₄. 

(c) Based on the free energy changes of these reactions, which oxide is the most stable at room temperature?

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Substance Mno MnO₂ Mn₂O3 Mn304 ΔΗ (kJ mol-¹) -385.2 - 520.0 -959.0 - 1388 AG₁° Sº (kJ mol-¹) (J mol-¹K-¹) -362.9 - 465.2 -881.2 - 1283 59.71 53.05 110.5 155.6