Chemistry, 09.04.2020 22:31 blasius5897
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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A student added 1.100 g of copper (II) chloride (Molar Mass=134.45 g/mol) to a test tube with 20.0 m...
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