How many atoms of copper are in a penny made of 3.11 grams of copper?

Calculation Process

Molar mass of Copper: The molar mass of copper (Cu) is 63.55 g/mol.

Finding Moles: To find the number of moles in 3.11 grams of copper, we divide the mass by the molar mass. This gives us 0.0489 moles of Cu.

Avogadro's Number: Avogadro's number is 6.02x10²³, which represents the number of particles in 1 mol of any substance.

Converting Moles to Atoms: We then multiply the number of moles by Avogadro's number to get the number of atoms. In this case, 0.0489 moles of Cu will have 2.94x10²² atoms of Cu.

Conclusion: Therefore, there are 2.94x10²² atoms of copper in a penny made of 3.11 grams of copper.