3.14 × 10²⁴ Formula Units
As we know that 1 mole of any substance contains exactly 6.022 × 10²³ particles which is also called as Avogadro's Number. So in order to calculate the number of particles (formula units) contained by 5.23 moles of NaNO₃, we will use following relation,
Moles = Number of F. Units ÷ 6.022 × 10²³ F. Units.mol⁻¹
Solving for Number of F. Units,
Number of F. Units = Moles × 6.022 × 10²³ F. Units.mol⁻¹
Putting values,
Number of F. Units = 5.23 mol × 6.022 × 10²³ Molecules.mol⁻¹
Number of F. Units = 3.14 × 10²⁴ F. Units
Hence,
There are 3.14 × 10²⁴ Formula Units present in 5.23 moles of NaNO₃.