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    How many calories of heat will be released?

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    If 75 grams of steam at +140C is cooled to the point that it becomes ice at -5C, how many calories of heat will be released?

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    Solution Preview

    Divide your problem into the sections that we have:
    1. we have steam at 140 C going to 100 C
    2. when steam reaches 100 C it will also loose some heat by becoming a liquid. this would be the (DeltaH) of condensation which is a constant for water of course
    3. the liquid then loses energy as its temperature drops from 100 to 0
    4. water at 0 will become Ice at 0 and so losing more energy this step is (deltaH) fusion
    5. ice then loses more energy ...

    Solution Summary

    The solution determines how many calories of heat will be released.