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  5. 這題怎麼算～？
Chemistry
高中
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這題怎麼算～？

V2-15 鎵的原子量是69.72amu,假設鎵是由 69 Ga (68.926 amu) 與 "Ga (70.925amu) 兩種同位素所組成,請問Ga 所占的 百分率為何?
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