Here's how to calculate the grams of sodium chloride (NaCl) in 0.40 moles:

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.

* The molar mass of NaCl is 22.99 + 35.45 = 58.44 g/mol

2. Use the formula:

* grams = moles × molar mass

3. Plug in the values:

* grams = 0.40 mol × 58.44 g/mol

* grams = 23.38 g

Therefore, there are 23.38 grams of sodium chloride in 0.40 moles.