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Homework Help: Water to Steam Energy Question

  1. Jan 28, 2007 #1
    1. The problem statement, all variables and given/known data

    How much energy does it take to transform 500 g (0.5kg) of liquid water at 20 oC to steam at 100 oC? Note that the specific heat capacity of liquid water is 4.28x10^3 J/Kg/oC and the latent heat of vaporization for water is 2.3x10^6 J/Kg.

    2. Relevant equations
    Eh=mct ; m1c1t1=-m2c2t2 ; Eh = mLf ; Eh= mLv

    3. The attempt at a solution

    no clue..please help..
  2. jcsd
  3. Jan 28, 2007 #2

    Chi Meson

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    Homework Helper

    Two steps. first the water needs to be heated to 100 C, then the water has to evaporate. Both steps involve heat going into the water. Which two of those 4 equations do you need?

    By the way, in the first and second equation you list, it is not "T" but "change in T." (The triangle, "delta," means "change in...")
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