Giúp em với ạ em cần gấp Cho 1 lượng Halogen X2 pư vừa đủ vs 4,48l H2 (H=100%) sau pư thu đc khí A. Hòa tan khí A vào nước thu đc dd B. Trung hòa B bằng dung dịch Ba(OH)2 1M và NaOH 2M. Sau pư thu đc 32,5g muối. Halogen X2 là? A. Cl2 B. Br2 C. F2 S. I2

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