How do I solve this problem on the freezing and boiling point of ethylene glycol?

Question

What volume of ethylene glycol, C2H6O2, a nonelectrolyte, must be added to 15.0 L of water to produce an antifreeze solution with a freezing point of -25*C? What is the boiling point of the solution? The density of ethylene glycol is C2H6O2 is 1.11 g/cm^3 and density of water is 1.00 g/cm^3

Answer 1

DeltaT = imK

Delta T = -25 degrees

i = vant Hoff factor = 1 for ethylene glycol (EG)

m = molality of EG = moles EG/kg solvent water

K = freezing pt or boiling pt constant for water

15 liters water = 15 kg

Use the equation and solve for moles EG

Convert moles EG to grams EG using molar mass of EG

Finally, use density of EG(1.11 g/ml) to convert grams EG to volume EG