Chemistry 141
Spring, 2009
Name: ______________________________
T. Swanson
Homework 1 (50 pts)
The following problems should be turned in on Friday, Feb. 13 for grading.
1)
(16 pts) To the right is the framework of the molecule nitromethane:
a. Draw below a good Lewis structure for this molecule (be sure to show any
formal charges present on atoms).
H
H
O
C
N
O
H
b. Can you draw a second good Lewis structure for this molecule? If so, draw it.
c.
Estimate the following bond angles (in degrees) in the nitromethane structure:
H-C-H __________
C-N-O ________
O-N-O________
d. Which atoms, if any, are coplanar (lie in the same plane)? (Indicate on the nitromethane
structure shown up above).
2. (12 pt) Show the correct hybridization (sp, sp2, sp3) for the atoms indicated by an arrow:
O
H3C
H
(CH3)2CH-CN
H3C
H
C C C H
H3C
Chemistry 141
Spring, 2009
T. Swanson
3. (22 pt) For each skeletal structure shown below,
a) Draw out the bonds to hydrogen atoms
b) Below the structure, give the molecular formula
Cl
OH
O
HO
N
OH
O N
P
H2N
O
C
Cl
OH
(Vitamin C)
O
c) Suppose we want to run a reaction on 1.0 mmol (mmol = millimole) of the phosphorus
containing compound. How many mg (milligrams) must we weigh out?