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hienluxy428
2 năm trước
Phân tử của một hợp chất gồm 2 nguyên tử nguyên tố M liên kết với 1 và có phân từ khối nặng hơn phân tử hidro 31 lần. Tìm M PTK Hidro = 21 = 2đvC ?
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