how many atoms are in 3.2 moles of sodium chloride

Question

 this question is based on chemistry and i dont understand it

Answer 1

Looking at sodium chloride, NaCl, for every mole of NaCl there are Avogadro's number of formula units (molecules). So the number of formula units of NaCl (molecules) in 3.2 moles = 3.2 moles x 6.02x10²³ form.units/mole = 1.93x10²⁴ formula units (molecules).

 

Now, each molecule (formula unit) contains 1 atom of Na⁺ and 1 atom of Cl^-, for a total of 2 atoms/formula unit. So, total number of atoms is 1.93x10²⁴ formula units x 2 atoms/formula unit = 3.86x10²⁴ atoms