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Homework Help: The change in temperature of moist air

  1. Apr 9, 2016 #1
    1. The problem statement, all variables and given/known data

    1 kg of moist air and 1 g condenses.

    What will the change in the temperature of the moist air be?

    Heat of Vaporization = 2.5*10^6 J/kg

    2. The attempt at a solution

    The moist air will warm due to condensation.

    Heat of Vaporization=2.5*10^3 J/g

    Specific heat at constant pressure = 1004 J/K.kg = 1.004 J/K.g

    My next step was to divide the heat of vaporization with the specific heat to get the temperature in Kelvin, however the value seems to large.

    Any help would be grateful......Thanks.
  2. jcsd
  3. Apr 10, 2016 #2


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    How much too large?
  4. Apr 12, 2016 #3

    rude man

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    Assuming equlibrium, if some of it condenses and some of it does not, where on the p-v diagram must you be? Hint: think "quality".
  5. Apr 12, 2016 #4
    Did you remember to include the mass of the air (1kg) in the calculation?
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