Don't used hand raiting and don't used Ai solution A solution that is prepared by dissolving 0.026 g of K2CrO4 in a 851.26 mL volumetric flaskusing 0.05M KOH. The percent transmittance was found to be 63.16 in a cell with pathlength 0.15cm. The molar mass of K2CrO4 is 194.20g/mol. Calculate the molar absorptivity(L/mol.cm) Give your answer as a whole number.

The relationship between the transmittance and molar absorptivity of a solution can be described by…

Answered: A solution that is prepared by…

Principles of Instrumental Analysis

7th Edition

ISBN:9781305577213

Author:Douglas A. Skoog, F. James Holler, Stanley R. Crouch

Publisher:Douglas A. Skoog, F. James Holler, Stanley R. Crouch

Chapter1: Introduction

Section: Chapter Questions

Problem 1.9QAP

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A solution of a substance with a molar absorptivity of 167 M-1cm²¹ gives a transmittance of 4.26% in a cell with a 1.00 cm path length. What is the concentration of this solution in molarity? 0.0821 0.00387 0.000255 0.00821
.A 8 × 10-5 M solution of potassium permanganate has a transmittance of 45% when measured in 2.0 cm cell at wavelength of 526 nm. Calculate (a) the absorbance of this solution and (b) the molar absorptivity of KMnO4.
A solution containing 5.75 mg/100 mL of X (335 g/mol) has a transmittance of 41.6% in a 2.0 cm cell at 425 nm. Calculate the molar absorptivity of X at this wavelength. Note that: A = -log T
1. A compound has a molar absorptivity of 3.031 x 10° L cm1 mol1. If a 15.00 mm-length cell is used to hold the sample, and a transmittance of 19.53 % is measured, what is the molarity of the compound in solution?
A 0.035 g of KMnO4 was dissolved in 200 mL of distilled water. This solutionhad a transmittance of 40.5% when measured in a 1.05 cm cell at a wavelengthof 525 nm. Calculate the molar absorptivity of KMnO4. (MM = 158.034 g/mol)
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A 1.2cm diameter glass cuvette is filled with a Cu(NH3)42+ solution that is deep blue. The cuvette is placed into a pre-blanked spectrophotometer. At 620nm, the transmittance is 23%. If the solution has molarity = 0.0133 M and path length of light through the solution = 1.2 cm, what is the value of molar absorptivity at 620 nm?
A solution containing 6.24 mg/100 mL of A (335 g/mol) has a transmittance of 45.2% in a 2.00-cm cell at 425 nm. Calculate the molar absorptivity of A at this wavelength.
A solution containing 4.48 ppm KMnO4 has a transmittance of 0.576 in a 1.00 cm cell at52 nm. If the transmittance of a known solution is 0.0735 calculate the concentration of the unknown KMnO4 solution in ppm
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Copper was determined in an alloy sample by UV-visible spectrophotometry. The standard addition method was used. When exactly 5.0 mL of 1.00 g/L Cu standard solution was added to 100.0 mL of the sample solution, the blank-corrected absorption changed from 0.26 to 0.60. Calculate the concentration of Ču in the sample solution assuming the absorbance was directly proportional to the analyte concentration. A. 0.35 g/L B. 0.26 g/L C. 0.60 g/L D. 1.3 g/L E. 3.0 g/L
A student mixed 5.00mL of 0.0020M Fe(NO3)3, 3.00mL of 0.0020M KSCN, and 3.00mL of distilled water. The mixture reacted to form a reddish solution indicating that FeSCN2+ was formed, according to the equation below. An absorbance of 0.21 was measured for this solution in a Spectrophotometer set at a wavelength of 447nm. Fe³+ (aq) + SCN (aq) FeSCN2+ (aq) A calibration curve was used to find the equilibrium concentration of the product of this reaction: y = 1895x + 0.027 Calculate the equilibrium concentration of the Fe³+ Report your answer to 4 sig figs

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