Determine the mass of the sodium chloride substance, in the amount of 3 mol.

n (NaCl) = 3 mol.
Determine the mass of sodium chloride. We write down the solution.
For this we use the following formula.
n = m / M.
Where n is the amount of substance.
m is the mass of the substance.
M is the molar mass of the substance.
We find the molar mass of the substance.
M (NaCl) = 35.5 + 23 = 58.5 g / mol.
Next, we substitute the known values into the original formula.
m = n * M.
m = 3 mol * 58.5 g / mol = 175.5 g.
This means that the mass of 3 mol of sodium chloride is 175.5 grams.
Answer: the mass is 175.5 g.