Hòa tan 26,7 gam hỗn hợp NaI và NaCl vào nước được dung dịch A. Cho Br2 vừa đủ vào dd A được muối X có khối lượng nhỏ hơn khối lượng của hỗn hợp muối ban đầu là 4,7 gam. Khối lượng naCl trong hỗn hợp bằng:

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