Final answer:
The number of atoms in 5.17 mol of Sodium is 3.11 x 10^24 atoms.
Step-by-step explanation:
The number of atoms in a given amount of a substance can be calculated using Avogadro's number, which is 6.022 x 1023 atoms/mol. To calculate the number of atoms in 5.17 mol of Sodium, multiply the given amount by Avogadro's number:
Number of atoms = 5.17 mol * 6.022 x 1023 atoms/mol
Number of atoms = 3.11 x 1024 atoms
Learn more about Calculating the number of atoms in a given amount of a substance