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hungtruong210501
2 năm trước
Cho hh X gồm Fe,FeO,Fe2O3 . Cho 1 luồng khí CO đi qua ống sứ đựng m gam hh X nung nóng. Sau khi phản ứng kết thúc thu được 64 gam chất rắn A và11,2 l khí B có tỉ khối so với hiđro là 20,4. Tính m?
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