1.The relative atomic mass of a certain element X is 39.1 . X has
2 isotopes ^39X and ^yX with relative abundance of 90% and 10%
respectively.
(a)Calculate the value of y. What is this number called?
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chemist (only one)
2008-03-02 10:35 pm
回答 (1)
2008-03-02 11:10 pm
✔ 最佳答案
y is the mass number of isotope yX.Relative mass of 39X = 39 (approx.)
Relative mass of yX = y (approx.)
In 100 atoms of X, there are 90 39X atoms and yX atoms.
Relative atomic mass of X = (39 x 90 + y x 10)/100
39.1 = (3510 + 10y)/100
Hence, y = 40
Mass number of isotope yX = 40
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