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Additional Questions:1. One way to express the fixed proportion <strong>of</strong> elements in the compound copper (II) chloride is the chemicalformula. Another way is the Mass Percent <strong>of</strong> each element in the compound. For example:The “theoretical” Mass Percent <strong>of</strong> copper in the compound (as predicted by the true chemical formula, CuCl 2 ),would be:Complete this calculation and determine the Theoretical Mass Percent <strong>of</strong> Copper in copper (II) chloride:2. Now calculate the Mass Percent <strong>of</strong> Copper from your experimental data:3. Compare your experimental mass percent <strong>of</strong> copper to the theoretical value by calculating the Percent Error.C. Graham Brittain Page 8 <strong>of</strong> 9 9/28/2010
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