How many liters of the antifreeze ethylene glycol (C2H6O2) would you add to a car radiator containing 6.50 L of water if the coldest winter temperature in your area is -20.0 °C?. Calculate the boiling point of this water-ethylene glycol mixture. The density of ethylene glycol is 1.11 g/ml The Kf and Kb of water is 1.858 and 0.512, respectively.