問題詳情
20. 已知硼原子的質量為 10.81 amu，硼原子乃由原子量為 10.01 的 10B 和原子量為 11.01 的 11B 兩種同位素所組成，則 10B 所占硼原子的百分率約為下列何者？
(A) 20％
(B) 40%
(C) 70％
(D) 80％
(A) 20％
(B) 40%
(C) 70％
(D) 80％
參考答案
答案：[無官方正解]
難度：適中0.5
統計：A(0),B(0),C(0),D(0),E(0)
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