To determine the number of atoms in a given amount of substance, you can use Avogadro's number, which is approximately 6.022 × 10^23 atoms/mol.
Given that you have 26.8 moles of argon, you can calculate the number of atoms as follows:
Number of atoms = (Number of moles) × (Avogadro's number)
Number of atoms = 26.8 mol × (6.022 × 10^23 atoms/mol)
Number of atoms ≈ 1.612 × 10^25 atoms
Therefore, 26.8 moles of argon contains approximately 1.612 × 10^25 atoms.