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chuyenmontmx
2 năm trước
Câu 5. Cho nguyên tử khối của Bari là 137 . Tính khối lượng thực nguyên tố trên. A. mBa = 2,2742.10-22kg B. mBa = 2,234.10-24g C. mBa = 1,345.10-23kg D. mBa= 2,7298.10-21g
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