1. Find the molar mass of zinc (Zn):
* The molar mass of zinc is 65.38 g/mol.
2. Convert grams of Zn to moles of Zn:
* Divide the mass of zinc by its molar mass:
* 20.0 g Zn / 65.38 g/mol = 0.306 mol Zn
3. Use Avogadro's number to convert moles to atoms:
* Avogadro's number is 6.022 x 10^23 atoms/mol.
* Multiply the number of moles by Avogadro's number:
* 0.306 mol Zn * (6.022 x 10^23 atoms/mol) = 1.84 x 10^23 Zn atoms
Therefore, there are approximately 1.84 x 10^23 zinc atoms present in 20.0 g of Zn.
