F.3 Chemistry

2007-02-28 4:42 am

Element Y occurs in nature as two isotopes. The relative abundance of each isotope is shown in the table below:

Isotope 39Y xY
Relative abundance(%) 95.0 5.0
（39同x都寫係Y左上角）

The relative atomic mass of element Y is 39.1. Calculate the value of x.

詳細steps plz!!!

回答 (2)

小豬

2007-02-28 4:47 am

✔ 最佳答案

39 times95%+X times5%=39.1

37.05+5%X=39.1

39.1-37.05=5%X

2.05=5%X

X=41

參考: MY SELF

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式希

2007-02-28 4:57 am

(39*95+5X)/100=39.1
3705+5X=3910
5X=205
X=41

參考: ME

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