The element europium exists in nature as two isotopes:151Eu

来源：学生作业帮编辑：拍题作业网作业帮分类：数学作业时间：2024/05/19 21:01:54

The element europium exists in nature as two isotopes:151Eu has
a mass of 150.9196amu,and 153Eu has a mass of 151.96amu.Calculate the relative abundance of the two europium isotopes.
请大虾们顺便说说isotopes(同位素)的用法（公式用途之类的）谢谢~

-0- 英英英英英文题!
照我欠缺的英文能力来理解,大概amu表示量是伐?那么（151×150.9196+153×151.96）÷（150.9196+151.96）=152
算元素的平均分子量就是各同位素相对原子质量×丰度.
丰度就是该原子的数量占该元素所有原子数量的百分比.假设有10个151EU 30个153EU的话,151EU的丰度就是25% 我上面的运算如果分式分离的话就是我说的这个公式

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