Final answer:
To calculate the number of moles in a 215g sample of copper, divide the mass by the molar mass of copper (63.5 g/mol), then multiply the result by Avogadro's number (6.022 × 10^23 atoms/mol). This gives you approximately 2.04 × 10^24 copper atoms.
Step-by-step explanation:
If a sample of copper weighs 215g, we can calculate the number of moles of copper atoms in this sample by using the molar mass of copper. The atomic mass of copper is approximately 63.5 g/mol. Using Avogadro's number, which is 6.022 × 1023 atoms/mol, we can find the total number of copper atoms in the sample.
To calculate the number of moles, you divide the mass of the sample by the molar mass of copper:
Number of moles = 215 g / 63.5 g/mol = 3.39 moles
Now to find the total number of atoms, multiply the number of moles by Avogadro's number:
Number of atoms = 3.39 moles × 6.022 × 1023 atoms/mol
Number of atoms = 2.04 × 1024 copper atoms