13) To determine the number of moles of Cu in the sample, the students measured the absorbance of known concentrations of Cu(NO3)2(aq) using a spectrophotometer. A cuvette filled with some of the solution produced from the sample was also tested. The data recorded by one of the students are shown in the table above. On the basis of the data provided, which of the following is a possible error that the student made? O The Cu(NO,)2(aq) from the sample was not diluted properly. O The spectrophotomer was originally set to an inappropriate wavelength, causing the absorbance to vary unpredictably. O The student labeled the cuvettes incorrectly, reversing the labels of two of the solution. The spectrophotometer was set to read transmittance instead of absorbance.

13) To determine the number of moles of Cu in the sample, the students measured the absorbance of known concentrations of Cu(NO3)2(aq) using a spectrophotometer. A cuvette filled with some of the solution produced from the sample was also tested. The data recorded by one of the students are shown in the table above. On the basis of the data provided, which of the following is a possible error that the student made? O The Cu(NO,)2(aq) from the sample was not diluted properly. O The spectrophotomer was originally set to an inappropriate wavelength, causing the absorbance to vary unpredictably. O The student labeled the cuvettes incorrectly, reversing the labels of two of the solution. The spectrophotometer was set to read transmittance instead of absorbance.

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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Concept explainers

Stoichiometry

Stoichiometry is a chemical division that evaluates the quantitative content of the chemical process with the help of the reacting molecules or products taking part in the reaction. The term “stoicheion” in “Stoichiometry”, is an old Greek term for "element" whereas “metron” means "measure".

Question

13) To determine the number of moles of Cu in the sample, the students measured the
absorbance of known concentrations of Cu(NO3)2(aq) using a spectrophotometer. A
cuvette filled with some of the solution produced from the sample was also tested. The
data recorded by one of the students are shown in the table above. On the basis of the
data provided, which of the following is a possible error that the student made?
O The Cu(NO,)2(aq) from the sample was not diluted properly.
O The spectrophotomer was originally set to an inappropriate wavelength, causing the
absorbance to vary unpredictably.
O The student labeled the cuvettes incorrectly, reversing the labels of two of the solution.
The spectrophotometer was set to read transmittance instead of absorbance.

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