Question

What is the mass of one atom of copper in grams?

Answer 1

1 atom of Cu has a mass of $1.055\times {10}^{-22}$ g.
Explanation:
$1atomCu.\frac{1molCu}{6.022\times {10}^{23}atomsCu}.\frac{63.546gCu}{1molCu}=1.055\times {10}^{-22}gCu$

1 atom of copper must be converted in moles to express it as a quantity that can be converted into grams (our second step).

Avogadro's Number (1 mole=6.022×1023particles) and the relative atomic mass of copper (1 mole of copper = 63.546 g) are the equalities required to make this conversion.