Isotopes: percentage of frequency 6, atomic structure (Atom-19) Silver [translation unavailable] as mixed of two isotopes before 107Ag, nuclear mass 106.906 u and 109Ag with the nuclear mass of 108.905 u. What percentage share does each isotope have? Calculation only to to the point, to the equation only still a unknown size has.

  Exercise: Atom-19    

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Silver [translation unavailable] as mixed of two isotopes before ¹⁰⁷Ag, nuclear mass 106.906 u and ¹⁰⁹Ag with the nuclear mass of 108.905 u. What percentage share does each isotope have? Calculation only to to the point, to the equation only still a unknown size has.

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Solution:

1. Isotope I: ¹⁰⁷Ag, 106.906 u, x %
2. Isotope II: ¹⁰⁹Ag, 108.905 u, y %
3. x % + y % = 100 %
4. y % = 100 % – x %
5. PSE: m(₄₇Ag) = 107.8662 u
6. x·106.906 u + (1-x)·108.905 u = 107.8662 u
7. not required, but as exercise, after solving x shall have a value of 51.966% for the isotope I
       and 48.034% for isotope II

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