Chem 321 - Answers - Edubirdie

University:
California State University, Northridge
Course:
CHEM 321/L | Chemical Analysis I and Lab
Academic year:

2013
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2
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Chem 321 Quiz 1 1. (3) Name Answer Key The following results were obtained for the mass percent iron in an unknown. 12.29% 12.35% 12.39% 12.32% Calculate the average and the RMD (in ppth) for this set of results. 12.338% 2.6 ppth If the “true value” is 12.41%, what is the relative error (in ppth) associated with the average above? (2) 5.8 ppth 2. Seawater typically contains 1.27 x 103 ppm Mg2+ (24.305 g/mol). Calculate the molar concentration of this ion if the density of seawater is 1.02 g/mL. (5) 0.0533 M Chem 321 Quiz 1 3. Name Answer Key How should an experimental result of 1.49518% be rounded off to reflect at least 6 ppth relative error in the measuring process? Justify your answer. (3) Reporting the result as 1.50% leads to a relative error of: This is very close to the known minimum relative error in the measurements so the answer should be rounded to 1.50%. (Note: Reporting the result as 1.495% leads to an implied relative error of 0.67 ppth, a value that is not as close.)

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