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Homework Help: Energies of interaction between molecules

  1. Feb 22, 2015 #1
    1. The problem statement, all variables and given/known data
    Estimate the energies of interaction at 25 °C between (i) two hydrogen molecules and (ii) two nitrogen molecules, if each pair is separated by 0.3 nm. Explain fully and clearly your reasoning and any assumptions you make in your answer. State the source of the values of any molecular properties you use in your calculation.

    2. Relevant equations
    Would I use the London dispersion force equation for this?
    V = -3/4 α2I/r6

    3. The attempt at a solution
    so for hydrogen -3/4 x α2 x 1312 x 103/(3 x 10-10)6
    Is this the right approach? Not sure where to get a value for polarisability from
  2. jcsd
  3. Feb 22, 2015 #2

    Quantum Defect

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    Gold Member

    This looks right to me.
    Polarizabilities should be given in Hirschfelder, Curtiss, and Bird.
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