Chem Lab1 - A Research Questions 1 What is the percent(mass of copper found in a post-1983 penny B Observations and Results The features of the penny we

Chem Lab1 - A Research Questions 1 What is the percent(mass...

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A.Research Questions1.What is the percent (mass) of copper found in a post-1983 penny?
Calculations: - Standard Solution 2 + ¿ 1 molCu 63.55 gCu 1 molCu So 4 5 H 2 O 1 molCu 249.72 gCu SO 4 5 H 2 O 1 molCu SO 4 5 H 2 O 0.08 gCu ¿ ¿ 0.314 gCu SO 4 5 H 2 O - Beers Law: A = εC , where A is Absorbance, ԑ is molar absorptivity, C is Concentration So C = A ε 0.230 ACu 2.8819 Lmol 1 cm 1 = 7.98 10 2 g 250 ml Cu Percent copper: 7.98 10 2 gCu 2.5 g Penny ( 100 ) = 3.2 Cu C. Claims The percentage of copper found in a penny’s mass is 3.2%, according to our results. D. Evidence

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