Q. How many vibrational modes does ethanol have? Explain why.
Q. How many vibrational modes does ethanol have? Explain why.
Homework Answers
SInce Ethanol is C2H5OH and hence number of atoms is 9.
For a Molecule with n atoms total no, of modes are 3n thus total no. of modes are 3*9 = 27
While 3 constiutes the translational modes and it is a 3-D molecules hence have 3 rotational modes and the rest are all vibrational modes which are 27-6 = 21
Thus there are 21 vibrational modes in Ethanol
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Semester 1, 2017 Page 20 of 26 Question 34 (14 marks) (a) How many vibrational modes does CO2 possess? (1 mark) (b) Sketch each of the vibrational modes of CO2, including directions for stretching and/or bond bending. (4 marks) Semester 1, 2017 Page 21 of 26 (c) Identify which modes, as determined in question b above, are infrared active and Raman active. (2 marks) (d) Oxygen does not absorb infrared radiation, hence is not a greenhouse gas. Provide a reason...
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How many vibrational frequencies will have dicyan molecule (CN)2 in the IR spectrum? a) 6 b) 5 c) 7 d) 8
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