Chm 204 Expt 3 Fall 2021 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.
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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). See the pre-lab presentation. *
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.
(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(s) most closely matches your results? If your choice is between two, check them both.
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