Cho 1 luồng khí CO đi qua ống sứ đựng 0,04 mol hỗn hợp gồm FeO và Fe2O3 đốt nóng. Sau thí nghiệm thu được 4 chất rắn có khối lượng 4,784g. Khi đi ra khỏi ống sứ hấp thu vào dung dịch Ca(OH)2 dư thu được 4,6g kết tủa. Tính % khối lượng FeO và Fe2O3 trong hỗn hợp ban đầu
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