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Một hỗn hợp X gồm ankan A và anken B,A có nhiều hơn B 1 nguyên tử C,A và B đều ở thể khí (ở đk thường).Khi cho 6,72l khí X(đktc) đi qua nước brom dư , khối lượng bình brom tăng lên 2.8g,thể tích khí còn lại chỉ bằng 2/3 thể tích hỗn hợp X ban đầu.CTPT của A,B và khối lượng của hỗn hợp X.
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