 | Sample Lab Questions Investigation #15:
"Molecular Masses of
Pharmaceutical Chemicals"
|
These questions have been taken from lab quizzes given in previous years.
Some of the answers are listed at the end.
Note: The subscripts and superscripts may not appear as such. It depends upon your web browser.
- 1.
- (1pt) Define sublimation.
- 2.
- (1pt) Draw a hot bunsen burner flame. Indicate the color and the area of the flame that is the hottest.
- 3.
- (1pt) How does the melting point of a pure sample of a compound compare to the melting point of an impure sample of the same compound?
- 4.
- a. (1pt) Determine the molecular formula for the compound with the following structural formula:
- b. (1pt) Determine the molecular mass for this compound.
- 5.
- (4 pts) A 21.6 mg sample of an organic compound was mixed with 420 mg of camphor to form a solution that melted at 169.8°C. What is the molecular mass of the organic compound? (Kf of camphor = 37.7°C•kg•mol-1, melting point of the camphor = 177.0°C).
Answers
| 4. | a. | C15H19NO4 |
| b. | 277.31 g/mol |
| 5. | | 270 g/mol |
To report any corrections, please e-mail Dr. Wendy Keeney-Kennicutt.