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kellyrad.153
2 năm trước
điều chế C2H2 bằng phương pháp làm lạnh nhanh CH4 thu được hỗn hợp khí A gồm C2H2, H2 chưa phản ứng biết tỉ khối của H2 so với A = 5. tính H% phản ứng
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