Q:

How many grams of salt (NaCl) must be dissolved in water to make 2 liters of a 2M salt solution

Answer

The molar mass of Cl is 34.45 g/mol and of NaCl is 29 + 35.45 = 58.45 g/mol. (2 L)(2 mol/L)(58.45 g/ mol) = 233.8 g of salt.