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16 April, 13:47

The mass of a single gold atom is 3.27*10-22 grams. How many gold atoms would there be in 70.6 milligrams of gold?

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  1. 16 April, 14:16
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    [Total mass of gold atoms] = [Mass of one gold atom] x [number of gold atoms]

    divide both sides by mass of one atom:

    [Total mass of gold atoms] / [Mass of one gold atom] = [number of gold atoms]

    (0.130 grams) / (3.27E-22 grams/atom) = 3.975535168E20 or 397 quintillion gold atoms.
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