Here's how to calculate the mass of 8 moles of sodium chloride (NaCl):

1. Find the molar mass of NaCl:

* Sodium (Na) has a molar mass of 22.99 g/mol

* Chlorine (Cl) has a molar mass of 35.45 g/mol

* Molar mass of NaCl = 22.99 g/mol + 35.45 g/mol = 58.44 g/mol

2. Calculate the mass:

* Mass = moles x molar mass

* Mass = 8 moles x 58.44 g/mol

* Mass = 467.52 g

Therefore, the mass of 8 moles of sodium chloride is 467.52 grams.