giúp mình Đốt cháy hoàn toàn 4,6 gam hợp chất hữu cơ A thu được 4,48 lít khí CO 2 (đktc) và 5,4 gam nước. Biết khối lương mol của hợp chất A là 46 gam. Hãy xác định công thức phân tử của A, viết công thức cấu tạo.

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