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An Atom of Gallium Has a Mass of 69

Question 18

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An atom of gallium has a mass of 69.72 amu.On of its isotopes, An atom of gallium has a mass of 69.72 amu.On of its isotopes, ,has a 39.89% abundance.Since 1 amu = 1.6606 x 10<sup>-24</sup> g,how many atoms of this gallium isotope would be present in a 1.00 mg sample of gallium? A) 3.445 x 10<sup>18</sup> atoms B) 8.637 x 10<sup>18</sup> atoms C) 2.165 x 10<sup>19</sup> atoms D) 9.501 x 10<sup>18</sup> atoms ,has a 39.89% abundance.Since 1 amu = 1.6606 x 10-24 g,how many atoms of this gallium isotope would be present in a 1.00 mg sample of gallium?


A) 3.445 x 1018 atoms
B) 8.637 x 1018 atoms
C) 2.165 x 1019 atoms
D) 9.501 x 1018 atoms

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