giúp vs ak Trộn 400 ml hh khí gồm N2 và một hidrocacbon A với 900ml O2 ( dư) rồi đốt cháy. Thể tích hh khí và hơi sau khi đốt là 1,4 Lít. Làm ngưng tụ hơi nước thì còn lại 800ml khí. Cho khí này lội qua dd KOH dư thì còn 400ml. Các khí đo trong cùng điều kiện nhiệt độ, áp suất. Tìm CTPT của A

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