1. Find the molar mass of sodium (Na):
* The molar mass of sodium is approximately 22.99 g/mol.
2. Calculate the number of moles of sodium:
* Divide the mass of sodium by its molar mass:
* moles of Na = (28.75 g) / (22.99 g/mol) ≈ 1.25 mol
3. Use Avogadro's number to find the number of atoms:
* Avogadro's number is approximately 6.022 x 10^23 atoms/mol.
* Multiply the number of moles by Avogadro's number:
* Number of atoms = (1.25 mol) * (6.022 x 10^23 atoms/mol) ≈ 7.53 x 10^23 atoms
Therefore, there are approximately 7.53 x 10^23 atoms in 28.75 g of sodium.
