How many atoms are in 2.70 moles of iron (Fe) atoms?

4.48 * 10-24 atoms Fe

1.63 * 1024 atoms Fe

2.23 * 1023 atoms Fe

6.02 * 1023 atoms Fe

The answer is 1.63 * 1024 atoms Fe.

Avogadro's number is the number of units (atoms, molecules) in 1 mole of substance:

6.023 * 10²³ atoms per 1 mole

So, how many atoms are per 2.70 moles:

6.023 * 10²³ atoms : 1 mole = x : 2.70 moles

x = 6.023 * 10²³ atoms * 2.70 moles : 1 mole

x = 16.3 * 10²³ = 1.63 * 10 * 10²³ = 1.63 * 10²⁴ atoms