A12.0 wt% solution of cacl2 (110.98 g/mol) has a density of 1.107 g/ml.

a) what is the mass (in milligrams) of a 15.0-ml solution of 12.0 wt% cacl2?

b) what is the mass (in grams) of cacl2 in 431.3 ml of a 12.0 wt% solution of cacl2?

c) what is the formal concentration of cacl2 (in molarity) of the 431.3-ml cacl2 solution described in part b?

a) Mass of solution is 16,605 milli grams.

b) 57.29 grams is the mass of calcium chloride in 431.3 mL of a 12.0 wt% solution.

c) 1.1967 mol/L is the formal concentration of calcium chloride in 431.3 mL solution.

Explanation:

Mass by mass percentage of calcium chloride solution, wt% = 12.0%

Density of the solution = d = 1.107 g/mL

a) Volume of the solution , V= 15.0 mL

Mass of the solution = m

Mass of solution = 16.605 g = 16,605 mg (1g = 1000 mg)

b) Mass of the solution = m

Volume of the solution = V = 431.3 mL

Mass of calcium chloride = x

w% = 12.0%

57.29 grams is the mass of calcium chloride in 431.3 mL of a 12.0 wt% solution.

c) Moles of calcium chloride =

V = Volume of the solution in Liters

n = 0.5161 mole

V = 431.3 mL = 0.4313 L

1.1967 mol/L is the formal concentration of calcium chloride in 431.3 mL solution.