4. Розставте коефіцієнти в схемах хімічних реакцій: a) _Al +_HCl →_AlCl3 +__Hz; B)_Al +_Oz → _Al2O3; - д) _Zn +_HCl →_ZnCl2 +_H2; €) HCl +_Al2O3 →_AlCl3 +_H2O; ж) _Ba(OH)2 + HCl →_BaCl2 + H2O б) _Al(OH)3 → _Al2O3 + _H2O; г)_HgO →_Hg +_O2; e) _Fe + __H2O → _Fe3O4 + _Hz;​
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