Question: how to find how many atoms of an element are in a compound?
Answer: 1 mole of Cu atoms = 6.022 × 1023 Cu atoms. 1 mole of S atoms = 6.022 × 1023 S atoms. 1 mole of Cu2S molecules = 6.022 × 1023 Cu2S molecules. 1 mole of pennies = 6.022 × 1023 pennies.