CHM317_s12_Homework_1 - CHM317 Homework assignment #1 Due...

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CHM317 Homework assignment #1 Due Wednesday, January 25, 2012 at 2:10 pm (the start of lecture) Show your work. Full credit may not be awarded unless the work is shown. Assignment #1 is out of a total of 28 marks 1. Energy Scales (4 marks) Energy is expressed using many different units in chemistry. These include actual energy units such as eV (electron volts), joules, kJ/mol, kcal/mol, and energy equivalents such as nm, cm -1 and Hz. (a) Make a spreadsheet, using Microsoft Excel, Open Office Calc. or a similar program, to convert among energy units and fill in the following table: kJ•mol -1 kcal•mol -1 eV nm m cm -1 Hz H-bond in H 2 O dimer 3.4 O-H stretch in cold, gas phase methanol 3686 O-H stretch in MeOH ice 3100-3400 Red laser pointer 633 Green laser pointer 532 Ag: Ionization Energy 7.58 Ag: 3d 5/2 electron binding energy 368.21 Radiation used in microwave ovens 1.2 × 10 5 Bluetooth 2.40-2.48 × 10 9 typical free energy difference for folded vs. unfolded protein 25 (b) In what part of the electromagnetic spectrum (visible, IR, etc.) does each transition lie?
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2. Molecular Energy Levels and Spectra (8 marks) You are working with molecule Y, for which the following energy level information is available: 576.3 nm light can excite molecule Y from the ground vibrational level of the ground electronic state (S 0 ) up to the ground vibrational level of the 1 st excited state (S 1 ). Relevant excited vibrational energy levels in the ground electronic state (S 0 ) lie +550 cm -1 ( 1 ) above the vibrational ground state and at +3620 cm -1 ( 2 ) above the vibrational ground state. Excited vibrational energy levels in the 1 st excited electronic state (S 1 ) lie at +547 cm -1 and at +3480 cm - 1 . Ignore any effects of rotations. For this question, assume that the transition probability is 1.0
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This note was uploaded on 02/13/2012 for the course CHM 317 taught by Professor Jokusch during the Spring '11 term at University of Toronto- Toronto.

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CHM317_s12_Homework_1 - CHM317 Homework assignment #1 Due...

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