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What was the percentage by mass of Cr in the ore sample?

What was the percentage by mass of Cr in the ore sample?

Chemistry
Chemistry
10th Edition
ISBN:9781305957404
Author:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste
Publisher:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste
Chapter1: Chemical Foundations
Section: Chapter Questions
Problem 1RQ: Define and explain the differences between the following terms. a. law and theory b. theory and...
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This data below applies to questions 19 23. A 22.34 g sample of chromium ore consisting of impure chromium oxide, Cr203, was analyzed by treating it with hydrogen peroxide, which converted all the chromium oxide into chromate ion (CrO42-): 2 Cr203 (s) + 3 H2O2 (aq) + 4 OH → CrO42- (aq) + 5 H20 (I) O.The solution containing the chromate ion from the sample was diluted to a volume of 0.500 L. A Beer's law plot made with a standard solution of CrO,2", using a cell with b = 1.00 cm was found to have a slope of 2.81 L/mol (and a negligible intercept); the solution made from the ore sample showed an absorbance of 1.618 when measured in an identical cell. Using these data, calculate the answers to questions 16 - 20. (You may want to work the answers out on paper before entering them. If you use scientific notation, enter it in "calculator" format, i. e. "1.234e-5")
Transcribed Image Text:This data below applies to questions 19 23. A 22.34 g sample of chromium ore consisting of impure chromium oxide, Cr203, was analyzed by treating it with hydrogen peroxide, which converted all the chromium oxide into chromate ion (CrO42-): 2 Cr203 (s) + 3 H2O2 (aq) + 4 OH → CrO42- (aq) + 5 H20 (I) O.The solution containing the chromate ion from the sample was diluted to a volume of 0.500 L. A Beer's law plot made with a standard solution of CrO,2", using a cell with b = 1.00 cm was found to have a slope of 2.81 L/mol (and a negligible intercept); the solution made from the ore sample showed an absorbance of 1.618 when measured in an identical cell. Using these data, calculate the answers to questions 16 - 20. (You may want to work the answers out on paper before entering them. If you use scientific notation, enter it in "calculator" format, i. e. "1.234e-5")
What was the percentage by mass of Cr in the ore sample?
Transcribed Image Text:What was the percentage by mass of Cr in the ore sample?
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