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Jawabannya :
E°sel :
2Cr^3+ + 6e → 2Cr. E° = -0,74volt
3Ba → 3Ba^2+ + 6e. E° = 2,90 volt
_______________________ +
3Ba + 2Cr^3+ → 3Ba^2+ + 2Cr. E°sel = 2,16 volt