Chem 14C Midterm Exam 2 Sol

Chem 14C Midterm Exam 2 Sol - Chemistry 14C Spring 200’?r...

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Unformatted text preview: Chemistry 14C Spring 200’?r Exam 2 Solutions Page 1 Statistics: High score, average and low score will be posted on the course web site after exam grading is complete. The exam is ready to be picked up when these numbers are posted. A note about exam keys: The answers presented here may be significantly longer than expected from a student taking the exam. An exam key serves not only to reveal What was expected, but to instruct you as well. To see the projected course grade cutoffs, consult the grading scale on the Chem 140 course web page. 1. C15H21N05 2. (a) 311 (b) 17% 18% also acceptable, depending upon how many digitsyou usedfor the calculation (1:) 1% 3. 7 4. mlzforM=353 Calculation: Formula = C13H27N05 Mass= (18 x12)+(2? x1)+(1x14)+(6x16)=353 vinyl C-H —I- ~3nsucm-1 q—alkle-H ‘—'—‘ ~29UUCIII'1 T CFC ester C=O —Iv ~lfiSl] cm'l ~174flcm‘1 |""|""\""I""| 'l IIIIJD 3000 EDDIJ LEIJEI 6. Difference #1: The IR spectrum of domoic acid features a carboxylic acid 0-H stretch in zone 2, which is absent in the IR spectrum of trimethyldomoate. Difference #2: The C=O stretch in the IR spectrum of domoic acid occurs 1725-1700 cm"1 whereas in the IR spectrum oftrimethyl domoate the C=O stretching frequency is in the range of 1750-1735 cm'l. Other answers are possible. 7. (a) The spectra are identical 8. Assuming hydrogens of CHgN are equivalent: Four singlets, five doublets, no triplets, and seven signals of more than three lines. ...
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