Percentage frequency of 4, atomic structure (Atom-17) Bromine occurs in nature as a mixture of the two stable isotopes 79Br and 81Br. Frequency: 79Br to 50.65%, m = 78.918338 u. Calculate from the average molar mass of the [translation unavailable] well, you know, the frequency and the mass of the 81Br in u and g/mol.

  Exercise: Atom-17    

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Bromine occurs in nature as a mixture of the two stable isotopes ⁷⁹Br and ⁸¹Br. Frequency: ⁷⁹Br to 50.65%, m = 78.918338 u. Calculate from the average molar mass of the [translation unavailable] well, you know, the frequency and the mass of the ⁸¹Br in u and g/mol.

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Hinweis: The molar mass of the [translation unavailable] is (PSE) 79.904 u or 79.904 g/mol

Solution:

Frequency of the second isotope: 100 – 50.65% = 49.35%
Thus: 0.5065·78.918338 u + 0.4935· x u = 79.904 u
x = 80.9156 u or 80.9156 g/mol

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