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Homework Help: Specific heat problem finding final temp with calorimeter system

  1. Nov 22, 2009 #1
    1. The problem statement, all variables and given/known data

    A 34 g block of ice is cooled to -75°C. It is added to 562 g of water in an 80 g copper calorimeter at a temperature of 22°C. Find the final temperature. (The specific heat of copper is 387 J/kg ·°C and the specific heat of ice is 2090 J/kg ·°C. The latent heat of fusion of water 3.33 x 10^5 J/kg and the specific heat of water is 4186 J/kg ·°C.) Answer in units of °C.

    2. Relevant equations

    1,000 g= 1 kg

    Q= mcdeltaT

    Qice + Qlost H20 + Qcopper containter =0

    mcdeltaT of ice + mL of ice + Qlost H20 + Qcopper container =0

    3. The attempt at a solution

    I tried the last equation.

    .034(2090) (75) + (.034) (3.33e-9) + (.562)(4186)(Tf-22) + (.08)(387)(Ttf-22)=0

    and i got 134.28 C which was wrong. Help!
  2. jcsd
  3. Nov 22, 2009 #2


    User Avatar
    Science Advisor
    Homework Helper

    Check the signs of the dT
    which have heat flowing in and which out
  4. Nov 22, 2009 #3
    i actually just got the answer, but thanks!
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