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Microwaved Superheated Water

  1. Nov 15, 2007 #1
    1. The problem statement, all variables and given/known data
    1 Liter of water is microwaved to 103 Celcius at 1atm atmospheric pressure.
    1)How much energy is released when you add a nucleation site to the container to release steam?Heat capacity of liquid water is 4.184 J/K*g
    2)Ignoring surface tension, how much steam in mL could be produced given the latent heat of boiling water is 2260 J/g?

    2. Relevant equations

    3. The attempt at a solution

    U=(4.184 J/K*g)(3 K)
    U=12.552 J/g


    U=H-PV H(.1 MPa, 103 C)=2676.2 kJ/kg
    U=(2676.2)-(.1 MPa)([10 [m]^{3}) steam tables and converting atm to MPa
    U=2675.2 kJ/kg

    As far as part 2 goes, I really need some help.
  2. jcsd
  3. Nov 18, 2007 #2


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    Staff Emeritus
    Science Advisor

    Convert the liter of water to a mass and determine the number of moles. One can find the volume of steam using the ideal gas - 1 mole of gas occupies 22.4 l of volume.

    Otherwise use a steam table and select the appropriate specific volume for steam at 1 atm and 103C (slightly superheated), and multiply by the mass.
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