Answer:
3.03 x 10²³ atoms Cu
Step-by-step explanation:
To find the amount of copper atoms, you need to (1) convert grams to moles (via average atomic mass) and then (2) convert moles to atoms (via Avogadro's number). The final answer should have 3 sig figs because the given value with the lowest amount of sig figs (32.0) also has 3 sig figs.
Avogadro's Number:
6.022 x 10²³ atoms = 1 mole
32.0 g Cu 1 mole 6.022 x 10²³ atoms
---------------- x ---------------- x -------------------------------- = 3.03 x 10²³ atoms Cu
63.55 g 1 mole