[CHM 111] Lab Report

[Andrew J. Pounds]

On 11/11/2018 04:04 PM,  wrote:
>
> Hello, Dr. Pounds,
>
>
> In the atomic spectra lab when we are finding the photon energy in
> kJ/mol, how are we to find that when if we use the energy equation our
> final unit is Joules, which we can only convert to kilojoules. Is
> there a specific amount of Hg and Na salt used in the lamps we can use
> to calculate number of moles? Thank you
>

The first thing you need to do is prepare a CALIBRATION PLOT for you
mercury lines.  I updated the example calibration plot on the class
website for this lab.  It is available at


http://theochem.mercer.edu/chm111/atomspec2.png


You make ONLY ONE calibration plot because you only have absolute
emission data for one set of lines -- mercury.


Using the Mercury Calibration plot, determine the wavelength, in nm, for
you other lines species -- record these in column 4.


For the mercury spectrum and the sodium salt you are asked to come up
with the energy of the transition in kJ/mol.  The equation
$E=\frac{hc}{\lambda}$, where $\lambda$ is in meters, allows you to
convert the energies to Joules per photon.   To convert to kJ/mol,
multiply this number by Avogadro's number and divide by 1000.



Lab this week has four components:


1. Cover Page (nothing in box)

2. Filled out report form

3. Calibration Graph

4. Copies from your lab notebook.



-- 
Andrew J. Pounds, Ph.D.  (pounds_aj at mercer.edu)
Professor of Chemistry and Computer Science
Mercer University,  Macon, GA 31207   (478) 301-5627
http://faculty.mercer.edu/pounds_aj

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