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pqanh00
2 năm trước
Hòa tan m gam tinh thể FeSO4. 7H2O vào nước sau đó cho tác dụng với dd NaOH dư, lấy kết tủa nung trong không khí tới khối lượng không đổi thu được 1,6 gam oxit. m nhận giá trị nào sau đây? a.4,56 b.5,56 c.10,2 d.3,04
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