What is the number of formula units in a 6.70 mol sample of FeCl3

Answer 1

When we deal with ionic compounds such as FeCl3, we use the term "formula units" instead of "molecules", but the approach is the same as with molecular (covalent) compounds. We will us Avogadro's number for the calculation.

6.70 mol FeCl₃ x 6.022x10²³ form.units / mole = 4.03x10²⁴ formula units