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thuthuy411
2 năm trước
a)phân hủy 12,25 g KCLO3 taọ ra 7,45 g KCL và O2. tính khối lượng O2 b)cho O2 trên tác dụng 16.8g Fe đc m(g)Fe3O4. tính m biết hiệu suất là 80%
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