Химия, 8-9 класс. Помогите уравнять реакции методом электронного баланса:
1. Al + MnO2 = Mn + H2O
2. Ba + HNO3 = Ba(NO3)2 + N2O + H2O
3. FeCl3 + KI = FeI2 + I2 + KCl
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