cho 15,7 g hỗn hợp gồm al và zn tác dụng với một lượng vừa đủ dung dịch hcl 36,5% thu được 7,84 l khí h2 ở điều kiện tiêu chuẩn. khối lượng dung dịch thu được sau phản ứng là

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