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tranhoangvu202006
2 năm trước
Bài 2 a) Trong 40 g natri hidroxit NaOH có bao nhiêu phân tử? b) Tính khối lượng của 12.1023 nguyên tử nhôm. c) Trong 28 g sắt có bao nhiêu nguyên tử sắt ?
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