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    johnroquid's Avatar
    johnroquid Posts: 1, Reputation: 1
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    #1

    Jan 18, 2009, 04:33 AM
    Heat and thermodynamics
    How can I solve this problem?

    The problem is:

    Find the total heat needed to evaporate 200 g of ice at -5 degrees celsius in a 175 grams beaker.
    KISS's Avatar
    KISS Posts: 12,510, Reputation: 839
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    #2

    Jan 18, 2009, 05:54 AM

    You need to include the two phase changes.
    hamid_cse's Avatar
    hamid_cse Posts: 1, Reputation: 1
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    #3

    May 21, 2009, 06:31 PM
    cp-cv=r
    Unknown008's Avatar
    Unknown008 Posts: 8,076, Reputation: 723
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    #4

    May 22, 2009, 10:39 AM

    First, find the energy to raise the temperature of the ice cube to 0 Celsius
    Then, find the amount of energy required to melt the ice.
    Afterwards, find the energy to raise the water temperature to 100 Celsius
    Finally, find the amount of energy required to evaporate the water.

    You should know your equations;

    for changes in temperatures

    for changes in state.

    Hope it helped! :)
    KISS's Avatar
    KISS Posts: 12,510, Reputation: 839
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    #5

    May 22, 2009, 11:08 AM

    The 175 gr beaker is there to confuse you. Don't use it.
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