Cho hỗn hợp etanol và phenol tác dụng với na dư thu được 3,36 lít khí hidro nếu cho hỗn hợp trên tác dụng với dd nước brom vừa đủ thu được 19,86 gam (kết tủa trắng ) . a) viết phương trình phản ứng. b) tính thành phần % khối lượng các chất trong hỗn hợp

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