Ответы на вопрос:
3cuo + 2nh3 = n2 + 3cu + 3h2o2n(-3) > n2(0) | 2 | 1cu(2+) > cu(0) | 6 | 3 3cus + 8hno3 = 3cu(no3)2 + 3s + 2no + 4h2o s(2-) > s(0) | 3 n(+5) > n(+2) | 2
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