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/mL.
m= density x V. = 1.1 x 150 = 165 g.
165 x 20/100 = 33 g of MgCl2.