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Homework Help: Temperature and heat matter!

  1. Apr 11, 2012 #1
    1. The problem statement, all variables and given/known data

    Calculate the amount of heat to be added to warm 150g of ice from -10celsius to produce steam at 110C?

    2. Relevant equations

    I believe some relevant equations would be :
    Q= mcdeltat
    Q= mlf

    I also have some values as:

    Cice= 0.5 Cal/gcelsius
    Lf= 80 Cal/g

    C water= 1.0 Cal/gC

    Steam= 0.5cal/gC
    Lv = 540cal/g

    3. The attempt at a solution

    My attempt is wrong. I just know the answer, but I want to learn how to get to it. Thank you all in advance!
  2. jcsd
  3. Apr 11, 2012 #2


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    Science Advisor
    Homework Helper

    hi domyy! :wink:

    show us your full calculations, and then we'll see what went wrong, and we'll know how to help! :smile:
  4. Apr 11, 2012 #3
    What did is wrong. I tried something simple but there's probably more that I do not know.
    I did:

    Q = 150g . 0.5 Cal/gC. 100C = 7500

    Also tried,

    Q= mlf = 150g . 80 Cal/g = 12,000

    But I know the answer is 109.5 kcal.
  5. Apr 11, 2012 #4


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    Science Advisor
    Homework Helper

    sorry, i can't follow that

    you seem to have left some things out

    can you please write it out properly?
  6. Apr 11, 2012 #5
    Q = 150g x 0.5cal/gC x 100C = 7500

    C= Celsius

    Q = mLf = 150g x 80 Cal/g = 12,000

    But it's wrong. The answer is 109.5 kcal. I need to know the formulas or steps I am missing. The problem is more than that. I believe I am supposed to find several values through equations and sum them.
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