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Change in internal energy in air

  1. Oct 12, 2009 #1
    If we apply 300 kJ of heat to 2500 moles of air at constant pressure, what is the change in internal energy?

    So far i think I use the equation: (f/x)nkT, but I don't know how to calculate the degrees of freedom and whether I do or not, and whether or not to calculate the number of moles by n=2500/6.022 x 10^23 (avogadro's constant), or if I just plug 2500 moles into n?
  2. jcsd
  3. Oct 12, 2009 #2

    Andrew Mason

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    Look up the Cp for air. It consists mainly of diatomic molecules (N2, O2), if you want to figure it out.

  4. Oct 13, 2009 #3
    ok, thank you very much its appreciated
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