# Chem II

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How many grams of ethylene glycol (C2H6O2) per kilogram of water are needed to give protection up to 120 °C in a car radiator?

• Chem II -

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.

• Chem II -

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.

• Chem II -

Hi,
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

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