Расставьте коэффициенты методом электронного баланса. 1) Zn+HNO3=Zn(NO3)2+H2O+NO
2)Na+H2SO4=Na2SO4+H2O+H2S
3)Cu+HNO3=Cu(NO3)2+H2O+NO2
4)Fe+H2SO4=Fe2(SO4)3+H2O+SO2
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