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15 October, 05:01

The mass of a single gold atom is 3.27*10-22 grams. How many gold atoms would there be in 43.2 milligrams of gold?

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  1. 15 October, 07:23
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    There are 1.32 * 10²⁰ atoms in 43.2 mg of gold.

    Step 1. Convert grams of Au to moles of Au

    Moles of SF₆ = 0.0432 g Au * (1 mol Au/196.97 g Au) = 2.193 * 10⁻⁴ mol Au

    Step 2. Convert moles of Au to atoms of Au.

    Atoms of Au = 2.193 * 10⁻⁴ mol Au * (6.022 * 10²³ atoms Au / 1 mol Au)

    = 1.32 * 10²⁰ atoms Au
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