1. Convert Formula Units to Moles

* Avogadro's Number: There are 6.022 x 10^23 formula units (or molecules) in one mole of any substance.

* Calculation: Divide the number of formula units by Avogadro's number:

(3 x 10^25 formula units) / (6.022 x 10^23 formula units/mol) = 49.8 moles NaCl

2. Convert Moles to Grams

* Molar Mass of NaCl: The molar mass of sodium chloride (NaCl) is approximately 58.44 g/mol (22.99 g/mol for Na + 35.45 g/mol for Cl).

* Calculation: Multiply the number of moles by the molar mass:

(49.8 moles NaCl) x (58.44 g/mol) = 2910 grams NaCl

Therefore, there are approximately 2910 grams of sodium chloride in 3 x 10^25 formula units of NaCl.