To calculate the number of moles in 100.0 g of copper, we need to use the formula:
Number of moles = Mass (g) / Molar mass (g/mol)
The molar mass of copper (Cu) is approximately 63.55 g/mol. Now we can plug the values into the formula:
Number of moles = 100.0 g / 63.55 g/mol
This calculation gives:
Number of moles ≈ 1.57 moles
So, in 100.0 g of copper, there are approximately 1.57 moles. Understanding moles is crucial in chemistry, as it allows us to relate the mass of a substance to the number of particles (atoms, molecules) present in that substance. This is particularly important when performing calculations in chemical reactions.