3Cu2O+14HNO3=6Cu(NO3)2+2NO+7H2O пожалуйста нипишите сверху заряды (+ -)
cu(+1)o(-2) + H(+1)NO3(-1) =Cu(+2)No3(-1) + N(+2)O(-2) +H2(+1)O(-2)
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cu(+1)o(-2) + H(+1)NO3(-1) =Cu(+2)No3(-1) + N(+2)O(-2) +H2(+1)O(-2)