Question: how to find out how many atoms are in a molecule?
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.