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thaitieunhi2311
2 năm trước
cho Br2 dư qua 41,45 gam hỗn hợp A gồm NaCl, NaBr,NaI, thu được 36,75 gam hỗn hợp muối B , tiếp tục cho Cl2 dư qua B thu được 23,4 gam hỗn hợp muối C. tính % khối lượng muối NaBr trong A
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