Integrated Exercises on Infrared Spectroscopy

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yasminea 3L
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Integrated Exercises on Infrared Spectroscopy

Postby yasminea 3L » Sun Oct 09, 2016 1:35 pm

Infrared spectroscopy is an important took for studying vibrations of molecules. Just as an atom can absorb a photo on suitable energy to move an electron from one electronic state to another, a molecule can absorb a photon of electromagnetic radiation in the infrared region to move from one vibrational energy level to another. In infrared spectroscopy, it is common to express energy in terms of v/c, with the units cm^-1 (read as reciprocal centimeters). (a) If an absorption occurs in the infrared spectrum at 3600 cm^-1, what is the frequency of radiation that corresponds to that absorption? (b) What is the energy, in Joules, of that absorption? (c) How much energy would be absorbed by 1.00 mol of molecules absorbing at 3600 cm^-1?

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Re: Integrated Exercises on Infrared Spectroscopy

Postby Armo_Derbarsegian_3K » Mon Oct 10, 2016 6:05 pm

To start off,

You should visualize it as v/c=3600cm^-1
then solve for v
that will give you a.

for b,
use the equation E=hv
and solve for E.

for c,
multiply the E from (b) by Avogadro's number to determine the energy for a mole.

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