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Biết 400ml dung dịch HCl 1M đủ để hòa tan hết 13g kim loại A hóa trị 2 a) Tìm kim loại A b) Nếu cũng lấy 400ml dung dịch HCl 1M thì có thể hòa tan bao nhiêu g oxit kim loại A
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