Hòa tan hết 31,6 gam hỗn hợp X gồm Fe, FeO, Fe2O3 và Fe3O4 trong đó tỉ lệ mol giữa FeO và Fe2O3 là 1:1, bằng dd H2SO4 đặc nóng. Kết thúc phản ứng thu đuợc 6,16 lit khi SO2 áktc. Khối lượng của Fe trong hôn hợp X là A. 15,4g B. 10,26g C. 8,4g D. 5,6g dạ em tính ra câu b mà em nghĩ em tính sai nên nhờ thầy cô và mn giúp đỡ em ạ

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