To determine the number of atoms in a given mass of a substance, you need to use Avogadro's number and the molar mass of the substance. Avogadro's number is approximately 6.022 x 10^23, and it represents the number of atoms or molecules per mole of a substance.
First, we need to find the molar mass of copper (Cu). The molar mass of copper is the atomic mass of copper, which is approximately 63.55 grams per mole.
Next, we can use the formula:
Number of atoms = (Mass of substance / Molar mass) x Avogadro's number
Plugging in the values:
Number of atoms = (16g / 63.55 g/mol) x (6.022 x 10^23 atoms/mol)
Number of atoms ≈ 2.389 x 10^23 atoms
Therefore, there are approximately 2.389 x 10^23 atoms in 16 grams of copper (Cu).