Chm 204 Expt 3 Fall 2020 Percent Copper in a Salt
You and your partner will normally submit one form together. If two forms are submitted by the same individual, the second one will be graded. If each partner submits a form, each will be graded individually. Units are required whenever they are appropriate. Significant figure mistakes can be costly. Preview the on-line questions on your cover sheet.
Enter your name. *
Enter your lab station in the format 1A, 2B, etc. (no space between number and letter) *
Section *
Carefully enter your CU NetID. *
Example: ABC99099
Check that you entered your CU NetID correctly. *
Example: ABC99099
If scientific notation is used, it must be in the only form recognized by Excel as demonstrated by this example: The number 0.000457 may be entered as such or as 4.57E-4 (Note: No speces), but NOT as 4.57 x 10^-4. See the pre-lab presentation, Slide 25. *
1. (2 pts) Enter the mass of your unknown sample, including units.
Report all of the decimal places obtained from the balance used.
2. (2 pts) Enter the mass of the copper obtained, including units.
Report all of the decimal places obtained from the balance used.
3. (5 pts) Enter the percent copper by mass, followed by the words "percent Cu".
(2 pts for calculation + 3 points for accuracy)
4. (2 pts) Enter the molar mass of the unknown, including units.
5. (1 pt) Based on your MM, which compound most closely matches your results?
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