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11 Nov 2019
4. IR spectroscopy and mass spectrometry provide information that is used in structural determination of chemical compounds. (a) Provide a discussion on how each technique operates and the type of chemical information it provides. Your discussion must include the chemical principles involved, sample requirements and sample processing, and instrumentation. (20 points) (b) The stretching frequency of a chemical bond is estimated by using the equation below. In which region of an IR spectrum would you expect to find the O-H (stretching) absorption band and what is the frequency? (10 points) Equation: v(cm-1) = 1/2Ïcv (k/p) Where: v(cm-I) = frequency of vibration k = force constant of the chemical bond (N/m) c = 3x108m/sec N (Newton) = Kg/sec2 Avogadros number = 6x1023 For single bonds k 5x10'N/m
4. IR spectroscopy and mass spectrometry provide information that is used in structural determination of chemical compounds. (a) Provide a discussion on how each technique operates and the type of chemical information it provides. Your discussion must include the chemical principles involved, sample requirements and sample processing, and instrumentation. (20 points) (b) The stretching frequency of a chemical bond is estimated by using the equation below. In which region of an IR spectrum would you expect to find the O-H (stretching) absorption band and what is the frequency? (10 points) Equation: v(cm-1) = 1/2Ïcv (k/p) Where: v(cm-I) = frequency of vibration k = force constant of the chemical bond (N/m) c = 3x108m/sec N (Newton) = Kg/sec2 Avogadros number = 6x1023 For single bonds k 5x10'N/m
Patrina SchowalterLv2
14 Aug 2019