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ally7366
ally7366
09.04.2020 • 
Chemistry

A student added 1.100 g of copper (II) chloride (Molar Mass=134.45 g/mol) to a test tube with 20.0 mL of water. The student then added 0.615 g of aluminum wire to the test tube and placed it in a hot water bath until the solution was colorless. When the reaction went to completion, the student scraped the copper into a pre-weighed piece of filter paper (2.440 g). The student massed the aluminum wire after the reaction, and its mass was 0.510 g. After allowing the copper to dry overnight, the final mass of the filter paper and copper was 2.826 g.

Dude I have an hour left of this test. I only NEED the percent error for recovered copper and percent yield for recovered copper.!!!

DATA TABLE
Record your answers here:
Initial mass of copper (II) chloride
1.100g

Initial mass of aluminum wire
0.615g

Mass of leftover aluminum wire
0.510g

Actual mass of aluminum reacted
0.105g

Mass of filter paper + copper
2.826g

Mass of filter paper
2.440g

Actual mass of recovered dry copper
0.386g

RESULTS TABLE
Record your answers here:

Moles of copper (II) chloride.
0.008181mol

Moles of aluminum that should react (theoretical)
0.005454mol

Mass of aluminum that should react (theoretical)
0.1472g

Percent error for reacted aluminum
76.1%

Predicted mass of recovered copper (theoretical)
2.17g

Percent error for recovered copper
???
Percent yield of recovered copper
???

Idk how correct these answers are but I keep getting a negative percentage for the yield and error.

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