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Finding the mass of iron using the heat equations

  1. Nov 11, 2014 #1
    1. The problem statement, all variables and given/known data
    Calculate themass of iron at 100C that causes 20.0 kg of water to change temperature from 16C to 18C. C of iron is 460 J/kg C. The C for water is 4190.



    2. Relevant equations
    q1+q2=0
    q=mct



    3. The attempt at a solution
    q1=-q2
    mct=-mct
    20(4190)(2)=-m(460)(100)
    167600=46000m
    3.5=m
     
  2. jcsd
  3. Nov 11, 2014 #2
    What's the final temperature of the iron? What was the temperature change of the iron?

    Chet
     
  4. Nov 11, 2014 #3
    That's my main issue right now because that is not given to me and I am having a hard time trying to figure how one would do that without the mass being given.
     
  5. Nov 12, 2014 #4
    If you put something hot in contact with something cold and let them equilibrate with one another, do they (a) reach different final temperatures or (b) reach the same final temperature?

    Chet
     
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