[CHM 181] Calibration Plot and Energies

[Andrew J. Pounds]

So for the lab that is due tomorrow night you need to turn in a 
calibration plot using ONLY THE MERCURY (Hg) LAMP data.  I am attaching 
a sample plot ( do not try to turn my plot in -- you'll end up in front 
of the honor council -- use your own data ).

Here is the link to the sample plot. 
<http://theochem.mercer.edu/chm181/atomspec2.png>

Once you make your own plot you can use it to determine the wavelengths 
of the lines from the other lights and salts.  You do not have to do the 
candle!

Finally, to calculate the energy for the for the mercury lines you have 
to use the equation E=hcλE=\frac{h c}{\lambda}

Where h is Planck's constant in J sec, c is the speed of light in 
meters/sec and lambda is the wavelength in meters.  Use nanometers on 
your graph but in your calculation of energy remember to convert to meters.

Example:  A photon with a wavelength of 418 nm has an energy of

E = (6.626x10^-34)(3x10^8)/(418x10^-9) = 4.756x10^-19 Joules

4.756x10^-19 x 6.022x10^23 = 286400 Joules / mol  = 286.4 kJ/mol

-- 
*Andrew J. Pounds, Ph.D.*
/Professor of Chemistry and Computer Science/
/Director of the Computational Science Program/
/Mercer University, Macon, GA, 31207 (478) 301-5627 /
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://theochem.mercer.edu/pipermail/chm181/attachments/20240312/3181baf7/attachment.html>