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Average Atomic Mass Practice

Average Atomic Mass Practice. Silicon has 3 isotopes with the following % abundances. Si-28, 92.23% Si-29, 4.67% Si-30, 3.10% Calculate silicon’s average atomic mass. . Answer. (28 x 0.9223) + (29 x 0.0467) + (30 x .031) = 28.11 amu. % Abundance Practice.

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Average Atomic Mass Practice

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  1. Average Atomic Mass Practice Silicon has 3 isotopes with the following % abundances. Si-28, 92.23% Si-29, 4.67% Si-30, 3.10% Calculate silicon’s average atomic mass.

  2. Answer (28 x 0.9223) + (29 x 0.0467) + (30 x .031) = 28.11 amu

  3. % Abundance Practice • Silver, Ag, exists as 2 isotopes, Ag-107 and Ag-109. Calculate the % abundance for each isotope of silver.

  4. Answer 107.8682 = (x)(107) + (1-x)(109) X = 0.5659 Ag-107 is 56.59% abundant Ag-109 is 43.41% abundant

  5. 2) Lithium exists as 2 isotopes, Li-6 and Li-7. Calculate the % abundance for each isotope of lithium.

  6. Answer 6.94 = (x)(6) + (1-x)(7) X = 0.059 Li-6 is 5.90% abundant Li-7 is 94.10% abundant

  7. Gallium consists of two naturally occurring isotopes with masses of 69 and 71 amu. The average atomic mass of Ga is 69.72 amu. Calculate the abundance of each isotope. • 69Ga = 40% 71Ga = 60% • 69Ga = 69% 71Ga = 31% • 69Ga = 29% 71Ga = 71% • 69Ga = 31% 71Ga = 69% • 69Ga = 64% 71Ga = 36%

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