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Homework Help: Very quick question

  1. May 10, 2008 #1
    1. The problem statement, all variables and given/known data
    Your 300 mL cup of coffee is too hot to drink when served at 90 degrees C. What is the mass of an ice cube, taken from a -20 degree C freezer, that will cool your coffee to 60 degrees C?

    2. Relevant equations

    3. The attempt at a solution

    I'm pretty sure I can do this problem, but the only thing I am unsure of is what the specific heat of the coffee is. Should I assume that is the same as that of liquid water? Thanks
  2. jcsd
  3. May 10, 2008 #2


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    Science Advisor
    Homework Helper

    Yes - there isn't much coffee in coffee and adding small amounts of solutes doesn't change the specific heat much, it does have a large effecton freezing/boiling points.

    Remember to include the latent heat of the ice melting as well as the specific heat of ice heating upto 0!
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