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Thermodynamics question

  1. Oct 25, 2009 #1
    1. The problem statement, all variables and given/known data
    A 100-g piece of metal initially at T = 75oC is submerged in 100 g of water initially at T = 25oC. The specific heat capacity of iron is 0.45 J g-1 °C-1 and the specific heat capacity of water is 4.18 J g-1 °C-1. What is the final temperature of both substances in oC?


    2. Relevant equations
    q=mc(delta T)


    3. The attempt at a solution
    well i tried to set mc(delta T)=mc(delta T), plug in all the values and solve for T(final), but i keep getting the wrong answer
     
  2. jcsd
  3. Oct 25, 2009 #2

    rock.freak667

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    What numbers did you put for each of the changes in temperature?
     
  4. Oct 25, 2009 #3
    mc(delta T)=mc(delta T)

    (100)(.45)(T(final)-75)=100(4.184)(T(final)-25)

    i solved that for T(final) but still got the wrong answer
     
  5. Oct 25, 2009 #4

    rock.freak667

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    For the term on the left side, (the metal at 75), it can't gain heat, it only loses heat. So That should be (75-Tfinal). Understand?
     
  6. Oct 25, 2009 #5
    oh, now i understand, thank you so much
     
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