уравнять реакции...1.)Na+H2So4-----H2+Na2So4
2)Al+H2So4----H2+Al2(SO4)3
3)Fe +CuSO4---FeSO4+Cu
2)Al+H2So4----H2+Al2(SO4)3
3)Fe +CuSO4---FeSO4+Cu
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2) 2Al+3H2SО4(р)--=--3H2+Al2(SO4)3
3)Fe +CuSO4=FeSO4+Cu
2) 2Al + 3H2SO4 - 3H2 + Al(SO4)3
3) 2Fe + 3CuSO4 --- Fe2(SO4)3 +3 Cu