Question
Water molecule has three vibrational degrees of freedom whereas ammonia
molecule has six vibrational degrees of freedom.
Answer :
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Ammonia (NH3), which is a nonlinear molecule consisting of four atoms. The relative positions of the three hydrogen nuclei are specified by the three distances between H—H pairs, and the position of the nitrogen nucleus is given by the three N—H distances. This permits a total of 3 x 4 — 6 = 6 vibra tional degrees of freedom. An example of a simple linear molecule is hydrogen cyanide (HCN) with three atoms. Here the relative positions of the three nuclei during vibration are given by the H—C and C—N separations, plus the
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