(a) The water molecule has three distinguishable molecular vibrations. Construct a

Chapter 12, Problem 12.31

(choose chapter or problem)

(a) The water molecule has three distinguishable molecular vibrations. Construct a diagram like Fig. 12.8 on p. 582 for the three vibrational modes of water. (Hint: Each vibration at its extremes must change the molecule so that it can be distinguished from the molecule before the vibration occurs.) (b) Classify each vibration as a stretching or bending vibration. (c) The IR spectrum of water vapor has three absorptions: 1595, 3652, and 3756 cm1 . Which are stretching vibrations and which are bending vibrations? Explain.

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