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x1%, X2% - zawartości procentowe danych izotopów
A1 , A2 - liczby masowe izotopów
Dane:
35Cl 37Cl
m.at.Cl = 35,45 u
Szukane:
X1% = ?
X2% = ?
35,45 u = X1 % · 35 + X2 % · 37 / 100%
X1 % + x2 % = 100%
35,45 = X1 % · 35 + (100-x1 % ) · 37 / 100%
35,45 = 35x1% + 3700 - 37x1% / 100%
3545 - 3700 = 35x1% -37x1%
-155 X1% = -2
1 x1% = 77,5 %
100%-77,5% = 22,5%
odp. Izotop 35 Cl stanowi 77,5%, a 37 Cl stanowi 22,5 %.
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