hỗn hợp khí A gầm CO , CO2 , C4H10 . Đốt cháy 17.92 lít khí A ( đktc) cần dùng 75.04 lít oxi ( đktc) thu đc 51.52 lít CO2 ( đktc) và a gam nước a) Tính % thể tích các khí trong A b) Tính a

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