CHEMISTRY 133

Spring, 2017 Homework Set 2

Only Additional Problems are Submitted for Grading

Set 2.1 - Complete for quiz on Mar. 30

Ch. 17: 3, 4, 11, 16, 24

Ch. 19: 1, 3-6, 10, 11, 13, 28

Homework Solutions to Set2.1 Text Problems

Additional Problem 2.1.1:

Link (for pdf - needed due to graphics)

Additional Problem 2.1.2. A monochromator is used with a grating that has 85 lines/mm, a focal length of 25 cm, and the grating set so that second order light exits the grating at an angle of 62° to normal. What slit width (in mm) is needed to obtain a resolution of 250 for 719 nm light?

Set 2.2 – Complete for quiz on April 13th
Ch. 20: 1, 2, 4, 7, 14, 21
NMR (R&R Ch. 11): 1, 3, 4, 5, 7

Homework Solutions to Set2.2 Text Problems

Additional Problem 2.2.1
Link (for pdf - needed due to graphics)

Additional Problem 2.2.2 In a 2.35 Tesla field, the magnetogyric ratios (g) for 31P is 1.08 x 108 T-1 s-1.
a)  At what frequency does 31P absorb light?
b)  If a sample has 1.000000 x 106 nuclei in the ground state, how many nuclei will be in the excited state?  How could the number of excited nuclei be decreased?
            (Hint: e-x = 1 - x when x is small)

Additional Problem 2.2.3  1,2-dichloropropane (CH3CH(Cl)CH2Cl) is analyzed by 1H NMR.  It is observed to have a jumbled multiplet (unclear number of split peaks) at 4.1 ppm, and simpler peaks at 3.6 and 1.6 ppm.
a) Indicate which protons are giving the signals at each peak.
b) Predict the splitting pattern (e.g. triplet) observed at 3.6 and 1.6 ppm.

Set 2.3 – Complete by April 20th (but no quiz)
Harris Text, Ch. 21: 5, 10, 13a-b, e, 24, 28
No Additional Problems

Homework Solutions to Set2.3 Text Problems