To calculate the number of zinc atoms in a piece of zinc, you need to use Avogadro's number and the molar mass of zinc. Avogadro's number (Na) is approximately 6.022 × 10^23 mol^-1, and the molar mass of zinc (Molar mass of Zn) is 65 g/mol.
First, determine the number of moles of zinc in the 10g piece:
Number of moles = Mass / Molar mass Number of moles = 10g / 65 g/mol Number of moles ≈ 0.1538 mol
Next, use Avogadro's number to calculate the number of atoms:
Number of atoms = Number of moles × Avogadro's number Number of atoms ≈ 0.1538 mol × (6.022 × 10^23 mol^-1) Number of atoms ≈ 9.258 × 10^22
Therefore, there are approximately 9.258 × 10^22 zinc atoms in a 10g piece of zinc.