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thuy51639
2 năm trước
1. Thực hiện dãy chuyễn hóa sau, ghi rõ điều kiện phản ứng nếu Na2SO4 ⎯⎯(1)→NaCl ⎯⎯(2)→ HCl ⎯⎯(3)→Cl2 ⎯⎯(4)→NaClO. 2. Nêu hiện tượng, viết phương trình hóa học xảy ra khi a. Sục khí SO2 vào dung dịch brom. b. Cho dung dịch Na2S vào dung dịch Pb(NO3)2. Câu II ( 2 điểm) Cho 18,4 gam hỗn hợp gồm Cu và Fe tác dụng với dung dịch H2SO4 đặc nóng dư thì thu được 7,84 lít khí SO2 (đktc, sản phẩm khử duy nhất) thoát ra. 1. Tính phần trăm khối lượng các kim loại trong hỗn hợp đầu. 2. Tính thể tích dung dịch NaOH 2M tối thiểu cần để hấp thụ hết lượng SO2 thoát ra ở thí nghiệm trên. ai giúp mik vs ạ
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