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Melting ice

  1. Nov 30, 2006 #1
    1. The problem statement, all variables and given/known data
    How much energy is necessary to completely melt an ice cube of mass 360.6grams that is initially at a temp of -25.2 degrees celsius.

    2. Relevant equations
    im thinkin i should use specific heat equation? is that right?
    c=Q/m(change of temp)

    3. The attempt at a solution
    Q= 18992
    i kno its wrong but im not sure what approach i need to take in finding the correct answer.

    the correct answer is 1.40x10^5
  2. jcsd
  3. Nov 30, 2006 #2
    anyone? help please?
  4. Nov 30, 2006 #3


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    Staff Emeritus
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    Gold Member

    You've done one part of the calculation. You've found the energy it takes to heat the ice from -25.2C to 0C, but it's still ice at 0C. You now need to convert this ice into water. How much energy does it take to do that?

    Look up the what the term 'Latent Heat' means.
  5. Nov 30, 2006 #4
    ahhh ok.. i knew i missed sumthin important

    so ... .3606x25.2x2090= 18992.0808
    then i use the latent heat of fusion for water and get .3606x(33.5x10^5)=120801

    combine them 18992.0808+120801= 139793.0808 --> 1.4x10^5

    thank you gokul
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