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trangnam357
2 năm trước
:Đốt cháy 10,5g hỗn hợp A gồm ch4,c2h4,c2h2 trong oxi thu đc khí B.Dẫn khí B vào trong dung dịch nước vôi dư thấy 75g kết tủa.Hỏi % khối lượng của ch4 tối đa là bao nhiêu
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