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Homework Help: Latent Heat of Fusion for Ice

  1. Apr 26, 2009 #1
    1. The problem statement, all variables and given/known data
    Determine the specific latent heat of fusion of ice given the amount of time it takes the ice to melt (150 seconds). Energy is supplied to the ice at 530 W. The sample is .25 kg.

    2. Relevant equations
    Q= ml

    3. The attempt at a solution
    (Time * 530W) = .25kg * L
    150 seconds * 530W = .25kg * L
    (150 * 530)/.25 = 318,000
    This seems huge, can anyone help me determine what the units are?
  2. jcsd
  3. Apr 26, 2009 #2


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    Homework Helper

    What are the units of the quantities you calculated with?

    Watts = Joules/sec

    So watts * sec = Joules

    You used mass as kg, so what you calculated is ...

    Latency = Joules/kg
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