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thoaphandiem
2 năm trước
Đốt cháy 33,6 gam sắt trong bình oxi, sau phản ứng thu được oxit sắt từ Fe3O4 a/ Tính thể tích khí oxi pứ ( đktc ) b/ Tính khối lượng oxit sắt từ sinh ra? c/ Cần dùng bao nhiêu gam kalipemangat KMnO4 để điều chế ra lượng oxi bằng ở pứ trên? (biết 2 mol KMnO4 ---> 1 mol O2 ) Cho K=39, Mn=55, Fe=56, O=16
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