Ethylene glycol, C2H6O2, is widely used as an automotive antifreeze. What is the minimum weight, in grams, of this compound that must be added to 10 kg of water to produce a solution that will protect an automobile cooling system from freezing at -20 ºC? Ethylene glycol is a non-electrolyte. Kf for water is 1.86 ºC/m.