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Very quick question

  • Thread starter bcjochim07
  • Start date
  • #1
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Homework Statement


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?


Homework Equations





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
 

Answers and Replies

  • #2
mgb_phys
Science Advisor
Homework Helper
7,774
12
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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