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Ede4ka [16]
3 years ago
15

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?

Chemistry
1 answer:
natima [27]3 years ago
3 0

There are 1.32 × 10²⁰ atoms in 43.2 mg of gold.

<em>Step 1</em>. Convert <em>grams of Au</em> to <em>moles of Au</em>

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

<em>Step 2</em>. Convert <em>moles of Au</em> to <em>atoms of Au</em>.

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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