hỗn hợp gồm hidrocacbon A và hidrocacbon B công thức CnH2n-2 (n lớn hơn hoặc bằng 2) có tỉ lệ mol là 1:2 và tỉ khối với hidro là 76/3. Đốt cháy 3.36 lít hỗn hợp sau đó dẫn toàn bộ vào 1000g dung dịch Ca(oh)2 7,4% được 5,5gam kết tủa. lọc kết tủa, đun dung dịch ko thây có thêm kết tủa 1, Tìm ctpt của A và B, biết chúng hơn kém nhau 1 phân tử C 2. Tính nồng độ phần trăm sau khi lọc kết tủa Giup minh voi, minh se vote 5 sao

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