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- Calculate the number of possible vibrational modes for each of the following molecules and assign frequency ranges to each. i) NH3 ii) C2H4 iii) CCl2F2 iv) CH3CH2OH b) Which of the above molecules will absorb IR radiations most strongly? Explain your answer.(a) How many vibrational modes are there in a linear triatomic molecule? Using an example, describe which vibrations are likely to be observed in the infrared spectrum.What are the total number of degrees of freedom and the number of vibrational modes for ethanol C2H6O?
- 6) This question is concerned with vibrational spectra (Infrared and Raman). a) How many normal modes of vibration are expected in these molecules? (Show calculations) i) Theobromine (the caffeine-like stimulant that is found in chocolate) b) In the molecular vibration shown here for trans-1,4-dichlorocyclohexane, both chlorine atoms stretch away from the carbon to which they are bonded (arrows). Will this mode be IR active? Will this mode be Raman active? In each case, why or why not? ii) Cyanopolyyne (an organic molecular wire that has been detected spectroscopically in interstellar space, and is postulated to be a precursor to biomolecules: HC=C-C=C-C=N c) Why are CH4 and CO₂ considered greenhouse gases, but O₂ and N₂ are not? d) Are the vibrations shown here a degenerate pair (Yes/No)? Why or why not? HN CI CH3 ci↑ ∙H -F CH3 -FDraw an energy level diagram (E vs. R) featuring a ground electronic state and two excited electronic states, one of which is bonding and one antibonding. Also clearly show vibrational and rotational energy levels. Explain what R is.Determine the vibrational modes of selected molecular movements (in the text, cis-ML2(CO) 2 and trans-ML2(CO) 2 are used as examples)
- 5. The fundamental vibrational frequencies for 1H19F and 2D19F are 4138.52 and 2998.25 cm-1, respectively, and De for both molecules is 5.86 eV. What is the difference in the bond energy (bond dissociation energy) of the two molecules? A) 0.567 eV B) 0.15 eV C) 0.0707 eV D) 0.254 eV2) Based on the number of atoms N, how many normal vibrational modes does CH4 have (CH4 is non-linear) (Section 18-6- what happens when molecule absorbs light) a) 10 b) 9 c) 6 d) 53. State which of the following molecules have (a) rotational absorption spectra, i.e. are rotationally active, (b) vibrational absorption spectra, i.e. are vibrationally active: N2, HF, CS2, SO2, SO, C6H6.
- How many normal modes (different types of vibrational motion) are predicted for the following substances (a) Ar (b) CO (c) CO2 (d) NH3?(c) Would you expect 109AgF to have a rotational constant that is higher,lower, or equal to that of 107AgF? Explain your reasoningDo you expect the fundamental vibrational frequency to be higher for HCl or NaCl? Explain.