Q1) What equation did you use to calculate the length of the conjugated section
ID: 919221 • Letter: Q
Question
Q1) What equation did you use to calculate the length of the conjugated section of the molecules? Explain how the equation was developed.
Q2) Explain why the conjugated region of polyenes can be used in this exercise as an adequate model for the particle in a box.
Q3) How does your mass compare to the known mass of the electron? Include a discussion of this comparison, and factors affecting the quality of your value. Is your number acceptable? What effect would any of the errors have on your result?
Analysis question from the lab UV-VISIBLE SPECTRA OF CONJUGATED POLYENES: An Experimental determination of the mass of the electron.
(1) isoprene, (2) Retinol Palmitate, (3) b-carotene, (4) Amphotericin B, and (5) Astaxanthin (see structures below). The UV-visible spectrum of the conjugated molecules was being recorded. The maximum of the graph wavelength vs absorbance was recorded.
Explanation / Answer
Given that the distance between C1 and C2 , the distance between C2 and C3 (= b), and the bond angle are known, the distance between C1 and C3 is
c=a2+b22abcos
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