Дополните схемы реакций и подберите коэффициенты:
1)MgO + .....= Mg(NO3)2 + ....
2)Al2O3 + .... = Al2(SO4)3 + ....
3).... + HBr = NaBr = ....
Составьте уравнения реакций за схемой химических преобразований:
Mg→MgSO4→Mg(OH)2→Mg(NO3)2
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