posted by jenny .
How many grams of ethylene glycol (C2H6O2) per kilogram of water are needed to give protection up to 120 °C in a car radiator?
Do you mean to keep the car radiator water from boiling?
delta T = 20 = Kb*molality
Solve for m.
m = mols/kg solvent
m = mols/kg water. You must know the volume of the radiator.
mol = grams/molar mass. You know mols an molar mass ethylene glycol; solve for grams ethylene glycol.
I feel I wasn't given enough information to answer the question originally, but I will try to do my best with what I was given.
First, you need the boiling constant of water which is 0.512 oC/m.
molality= Delta T / Kb
molality= 120 oC / 0.512 oC/m = 234 m