Energies of interaction between molecules

  • #1
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Homework Statement


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.

Homework Equations


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

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
 

Answers and Replies

  • #2
Quantum Defect
Homework Helper
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Homework Statement


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.

Homework Equations


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

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

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

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