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phamthehaisagittarius.vndn
2 năm trước
Cho các nguyên tố sau: Al, K, Si, P, Na, Ca và Fe. a. Tính khối lượng theo đơn vị cacbon của các nguyên tố sau: 2C, 7K, 3Si, 5P, 6Na, 9Ca, 10Fe. b. Tính khối lượng theo đơn vị gam của các nguyên tố trên. Biết: - Nguyên tử khối của chúng (tra bảng 1; trang 42 SGK). - Khối lượng nguyên tử hiđro (H) là mH = 1,66.10-27 Kg.
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