Abstract
E.m.f. measurements of the following galvanic cells with the solid oxide electrolyte (ZrO 2 + CaO) were carried out to determine the standard molar Gibbs energies of formation of NiO, Cu 2O, and CoO from solid and liquid metals and oxygen gas: (I) Pt|LaCrO 3|Ni(s,1),NiO(s)|ZrO 2+CaO|air|Pt, (II) Pt|LaCrO 3|Cu(s,1),Cu 2|ZrO 2+CaO|air|Pt, (III) Pt|LaCrO 3|Co(s,1),CoO(s)|ZrO 2+CaO|air|Pt. The differences between the e.m.f.'s of cells (I) and (II), and of cells (I) and (III) were compared with the e.m.f.'s of the cells: (IV) Pt|Ni(s),NiO(s)|ZrO 2+CaO|Cu(s,1),Cu 2O(s,1)|LaCrO 3Pt, (V) Pt|LaCrO 3|Ni(s,1),NiO(s)|ZrO 2+CaO|Co(s,1),CoO(s)|LaCrO 3|Pt. The results were compared with previously reported values.
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