Hòa tan hoàn toàn hỗn hợp gồm Fe, FeO, Fe2O3, Fe(OH)2, Fe(OH)3 trong dung dịch chứa 0,26 mol H2SO4, 0,22 mol HNO3, thu được dung dịch X(chỉ chứa muối) và 0,05 mol khí NO (sản phẩm khử duy nhất). Cho HCl dư vào X thấy có 0,01 mol khí NO thoát ra. Tính khối lượng muối khan X.
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Hòa tan hoàn toàn hỗn hợp gồm Fe, FeO, Fe2O3, Fe(OH)2, Fe(OH)3 trong dung dịch chứa 0,26 mol H2SO4,...
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