Answer to Question #166136 in General Chemistry for Tristan

Question

Calculate the mass (in grams) of magnesium chloride (MgCl2) that would be needed to prepare 150 mL of

a 20% by mass aqueous solution of the salt. The density of the solution is 1.1 g/mol.

Answer 1

Since the density of solution = 1.1grams/mol

Mass of 150ml of Aqueous solution = 1.1 x 150 = 165grams

MgCl2 present in the solution = 20% by mass of the solution

= (165/100) x 20 = 33.2grams

Hence, the mass of MgCl2 needed for the solution is 33.2grams