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How many grams of Cr were present in the solution made from the sample?

How many grams of Cr were present in the solution made from the 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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How many grams of Cr were present in the solution made from the sample?
Transcribed Image Text:How many grams of Cr were present in the solution made from the sample?
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")
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