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Homework Help: Evaporation of water and escaping particles

  1. Apr 16, 2010 #1
    1. The problem statement, all variables and given/known data

    The heat of vaporization is approx the product of the average energy of the escaping molecules (E) and the # molecules per gram, N

    I want to know, is this is as simple as it sounds
    2. Relevant equations

    so H=E*N?

    3. The attempt at a solution
    I'm supposed to find E, but I want to make sure I'm understanding it correctly

    I get E=(H(v)*MW(h2o))/(N_a)=1.6111 x 10^-20 cal/molecule = 6.7452 x 10^-20 J/molecule
    or 4.21 x10 eV/molecule

    I can't find anything on average energy per molecule escaped, so i don't know how to confirm.
  2. jcsd
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