Full set of Notes with Fill-Ins - San Jose State University

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Chem 155 Unit 15 274 of 31610. Draw a series of CO 2 molecules to illustrate theasymmetric stretching mode.O CO O C OOCO11. Is the asymmetric stretch IR active? Why?Yes, because at during the vibration the dipole momentchanges.12. Is the asymmetric stretch Raman active? Why?No, because at during the vibration the polarizability doesnot change. (increase in one CO bond polarizability isoffset by decrease in the other bond).13. Why is N 2 not a greenhouse gas?Homonuclear diatomics have no dipole moment changeduring their only vibrational mode: symmetric stretch.Page 274 of 316
Chem 155 Unit 15 275 of 31614. Cyclohexanone has a strong absorption peak at 5.86μmand at this wavelength a linear relationship exists betweenabsorbance and concentration.a. Calculate the frequency of this mode in cm -1 .b. Identify the part of the molecule responsible (the groupfrequency) for the absorbance at this wavelength.This is the ‘carbonyl’ or ketone symmetric stretch.c. Suggest a solvent that would be suitable for a quantitativeanalysis of cyclohexanone at this wavelength.CCl 4 , CHCl 3 or tetrachloroethylened. A solution of cyclohexanone (2.0 mg/mL) in the selectedsolvent has an absorbance of 0.40 in a cell with a pathlength of 0.025 mm. What is the detection limit for thiscompound under these conditions, if the noise associatedwith the spectrum of the solvent is 0.001 absorbanceunits.A=εbC calibration slope = εb10 45.86= 1706 cm − 1εbAC− 1⎞ ⎟⎠0.402.00 mg0.2 mg3s ⋅⎛b= ⎜C⎝ mLmm⋅mL3⋅0.001⎛⎝0.2⋅⎜mgmL⎞⎟⎠=− 10.015 mgmLPage 275 of 316
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