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

Question

(23 Na, 14 Cl)

explain please...

Answer 1

The molar mass of Cl is not 14, it's 34.45 g/mol. The molar mass of NaCl is 29 + 35.45 = 58.45 g/mol.

(2 L)(2 mol/L)(58.45 g/ mol) = 233.8 g of salt

Answer 2

There are 2 mol of NaCl per liter, and you have 2 liters.

Multiplying we get 4 mol of NaCl total.

The molar mass of NaCl is (35.45 + 22.99)= 58.44

4 mol NaCl x (58.44g/mol)= 233.8 grams

Answer 3

2mol NaCl (58.453g NaCl / 1mol NaCl) = 116.906g NaCl

since you want 2 liters, simply multiply 116.906 by 2 = 233.812g NaCl