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Concentration of Cu in unknown (penny) = (from calibration curve) Mass of Cu in sample (penny) = Recall that the volume of the solution obtained by dissolving the penny is 250.00 mL (0.25000 L). To calculate the mass of Cu in the penny, you will first need to calculate the moles of Cu. This is done by multiplying the concentration of Cu (in moles/L) by the volume (0.25000 L). Finally, multiplying the moles of Cu by the molar mass of Cu (in g/mole) yields the mass of Cu in the original sample. %3D Percent Cu in penny =

Concentration of Cu in unknown (penny) = (from calibration curve) Mass of Cu in sample (penny) = Recall that the volume of the solution obtained by dissolving the penny is 250.00 mL (0.25000 L). To calculate the mass of Cu in the penny, you will first need to calculate the moles of Cu. This is done by multiplying the concentration of Cu (in moles/L) by the volume (0.25000 L). Finally, multiplying the moles of Cu by the molar mass of Cu (in g/mole) yields the mass of Cu in the original sample. %3D Percent Cu in penny =

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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PART B. Spectrophotometric Determination of the Copper Content of a Penny Mass of penny: 3.1848 Date on penny: 1964 Concentration of standard Cu2 solution: M Volume, Standard Volume, 1 M [Cu] (M) % Transmittance Absorbance Cu (mL) HNO, (mL) (use Eq. 4) 2. O.06 84.3% Test tube 1 0-074 O.IS 60.95% 0.215 Test tube 2 8. 3 0 244 45.3% 0.344 Test tube 3 300M 33.65% Standard O.473 Unknown 52.822 0-277
Transcribed Image Text:PART B. Spectrophotometric Determination of the Copper Content of a Penny Mass of penny: 3.1848 Date on penny: 1964 Concentration of standard Cu2 solution: M Volume, Standard Volume, 1 M [Cu] (M) % Transmittance Absorbance Cu (mL) HNO, (mL) (use Eq. 4) 2. O.06 84.3% Test tube 1 0-074 O.IS 60.95% 0.215 Test tube 2 8. 3 0 244 45.3% 0.344 Test tube 3 300M 33.65% Standard O.473 Unknown 52.822 0-277
Concentration of Cu in unknown (penny) = (from calibration curve) %3D Mass of Cu in sample (penny) = Recall that the volume of the solution obtained by dissolving the penny is 250.00 mL (0.25000 L). To calculate the mass of Cu in the penny, you will first need to calculate the moles of Cu. This is done by multiplying the concentration of Cu (in moles/L) by the volume (0.25000 L). Finally, multiplying the moles of Cu by the molar mass of Cu (in g/mole) yields the mass of Cu in the original sample. Percent Cu in penny = Remember that percent by mass is simply the mass of Cu in the sample divided by the total mass of the sample (x 100%). Show your calculations in the space below. Attach the calibration curve to this page.
Transcribed Image Text:Concentration of Cu in unknown (penny) = (from calibration curve) %3D Mass of Cu in sample (penny) = Recall that the volume of the solution obtained by dissolving the penny is 250.00 mL (0.25000 L). To calculate the mass of Cu in the penny, you will first need to calculate the moles of Cu. This is done by multiplying the concentration of Cu (in moles/L) by the volume (0.25000 L). Finally, multiplying the moles of Cu by the molar mass of Cu (in g/mole) yields the mass of Cu in the original sample. Percent Cu in penny = Remember that percent by mass is simply the mass of Cu in the sample divided by the total mass of the sample (x 100%). Show your calculations in the space below. Attach the calibration curve to this page.
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