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Freezing point

  1. Oct 23, 2005 #1
    What is the freezing point of radiator fluid that is 50% antifreeze by mass? for water is 1.86 .

    I used
    delta: K_fc_m
    First I found the molar mass of ethylene glycol to be 62.07 g/mol. Then I multiplied 1/62.06 by 500g/1 kg to get 8.06 mol/kg for cm. I plugged these values in and got 15 C. However it is incorrect. I then thought to say that -15C was the freezing point, this was also wrong.

    Please help!
  2. jcsd
  3. Oct 23, 2005 #2
    What's the other 50% of the radiator fluid?
  4. Oct 24, 2005 #3


    User Avatar

    Staff: Mentor

    Usually water.
    Last edited by a moderator: Aug 13, 2013
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