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    Jack Song's Avatar
    Jack Song Posts: 1, Reputation: 1
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    #1

    Jun 14, 2009, 05:31 PM
    About Energy and temperature
    A 250g cup of water cools from 95C to 21C. How much energy is released?
    Thank you for answering my question!
    Perito's Avatar
    Perito Posts: 3,139, Reputation: 150
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    #2

    Jun 14, 2009, 07:40 PM

    Use the specific heat of water. Add to that the latent heat of fusion (enthalpy of fusion). Since you're cooling it from water and not from steam, you can ignore the latent heat of vaporization (enthalpy of vaporization).

    Enthalpy of fusion - Wikipedia, the free encyclopedia
    Unknown008's Avatar
    Unknown008 Posts: 8,076, Reputation: 723
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    #3

    Jun 15, 2009, 11:34 AM

    Perito? You sure you're right?

    There's no need for enthalpy of fusion, right? Water is liquid from 0 C to 100 C. Only use the equation



    Where H is the heat involved, m the mass of water, c the specific heat capacity of water, and theta the change in temperature.
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