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baongochoang8401
2 năm trước
có 29g hỗn hợp khí A gồm cacbon oxit và không khí ( không khí gồm oxi và nitơ là chính oxi chiếm 1/5 thể tích không khí) trộn với tỉ lệ 2/5 vè thể tích. Tính tỉ lệ phần trăm về thể tích của mỗi khí trong A ( chi tiết nha )
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