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In which Percentage Shares lying 28Si and 29Si before, where: The Share by weight in Percentage of 30Si 3.1 % is?
Notes: m(28Si) = 27.9769 u, m(29Si) = 28.9765 u, m(30Si) = 29.9738 u
Lösung: x = Hfrequency in % of 28Si, y = Hfrequency in % of 29Si
Equation 1: x + y + 3.1 = 100
Equation 2: (x·27.9769u + y·28.9765u + 3.1·29.9738u) / 100 = 28.09u
Weighted Average mass of Si (in accordance with Periodic system): 28.09 u
x and y with Equations 1 and 2 to determine. x = 92.2 %; y = 4.7%
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