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2 năm trước
Đốt cháy hết 2,86g hh kim loại Al, Fe, Cu đc 4,14g hh 3 oxit. Để htan hết hh oxit này, phải dùng đúng 0,4 lít dd HCl và thu đc dd X. Cô xạn dd X thì thu đc m gam muối khan. m = ? a, 9,45 b, 7,49 c, 8,54 d, 6,45
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