0.367 × 10²³ gold atoms
Explanation:
Assuming that the coin is pure gold, we use the Avogradro's number to find the number of gold atoms.
number of moles = mass / atomic weight
number of moles of gold = 12 / 197 = 0.0609 moles
Now we devise the following reasoning:
if in 1 mole of gold there are 6.022 × 10²³ gold atoms
then in 0.0609 moles of gold there are X gold atoms
X = (0.0609 × 6.022 × 10²³) / 1 = 0.367 × 10²³ gold atoms
Learn more about:
Avogadro's number
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