Final answer:
To calculate the number of Li atoms in 7.1 mol of Li, multiply the number of moles by Avogadro's number.
Step-by-step explanation:
To calculate the number of Li atoms in 7.1 mol of Li, we can use Avogadro's number, which is approximately 6.022 × 1023 particles per mole. First, convert the given amount of moles to atoms by multiplying it by Avogadro's number:
Number of Li atoms = 7.1 mol × (6.022 × 1023 atoms/mol) = 4.287 × 1024 Li atoms
Therefore, there are approximately 4.3 × 1024 Li atoms in 7.1 mol of Li.
Learn more about Calculating the number of atoms in a given amount of substance