(2) Adenine has a molar absorbance of 4 13.1 M-1cm-1 for 263 nm nucleic acid. What is the molar concentration of an acid solution that shows a permeability of 75% when 2 ml of it is placed in an absorption cell with a thickness of 1 cm?
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- If the measured absorbance at 280 nm of the protein in a 1.00-cm cuvette = 0.564, what is the extinction coefficient at this wavelength?in the determination of Keq in spectrophotometry, why is it that [KSCN] is lower in the preparation of unknown solutions.When 20 ul of substance Z containing 1.5 umols was made up to 1.0 ml in a cuvette, the absorbance change was 2.5. What is the molar extinction coefficient of Z?
- What is the concentration of a tyrosine solution when the absorbance at 280 nm is 1.5 using a 1 cm cuvette and the molar extinction coefficient is 1405 L/mol·cm?What spectral features might we see with 1000 scans at a resolution of 0.125 cm-1 ?A solution of Tryptophan has an absorbance at 280 nm of 0.54 in a 0.5 cm length cuvette. Given the absorbance coefficient of trp is 6.4 x 103 Lmol-1cm-1. What is the concentration of solution?
- An absorbing solution transmits just 38 of every 140 photons to the detector. If the cell width was 2.0 cm and the analyte concentration was 26 mg/L, what was the analyte absorptivity (ppm-1 cm-1)?The accuracy of a spectrophotometer can be evaluated by preparing a solution of 60.06-ppm K2Cr2O7 in 0.0050 M H2SO4 and measuring its absorbance at a wavelength of 350 nm using a cell with a pathlength of 1.00 cm. The absorbance should be 0.640. What is the molar absorptivity of K2Cr2O7 at this wavelength?Exactly 10.00-mL aliquots of a solution containing phenobarbital were measured into 50.00-mL volumetric flasks and made basic with KOH. The following volumes of a standard solution of phenobarbital containing 2.000μg/mL of phenobarbital were then introduced into each flask and the mixture was diluted to volume: 0.000, 0.500, 1.00, 1.50, 2.00 mL. The fluorescence of each of these solutions was measured with a fluorimeter, which gave values of 3.26, 4.80, 6.41, 8.02, 9.56, respectively. a. plot the data. b. derive a least squares equation for the data plotted in (a). c. find the concentration of phenobarbital from the equation in (b). d. calculate a standard deviation for the concentration obtained in (c).
- Calculate the concentration of a solution of peptide AWSME, in mM if the absorbance at 280 nm for the solution is 0.6 absorbance units, and a 0.2-cm cuvette is used. For the extinction coefficient, take into account that e280(Trp) = 5690 M-1 cm-1 and e280(Tyr) = 1280 M-1 cm-1. Round your answer to two decimals.pls explain whyWhat will be the effect on resolution if the ionic strength of the buffer initially used as mobile phase for elution in IEC was too high?a. Increaseb. Decreasec. No effectd. indeterminateIn an SDS-PAGE experiment, protein X has an Rf = 0.75, while protein Y has an Rf = 0.30. Which of the following statements are FALSE during the electrophoretic run?I. X has a greater charge-to-mass ratio than Y, since X has a smaller MW.II. X has a lower MW, and thus experiences less friction with the gel matrix.III. X has more hydrophobic groups, thus is in a more linearized state.IV. X is globular, while protein Y is rod-like, thus X has higher mobility.V. X is affected by less magnitude of electric field because of smaller MW.a. I and Vb. II and IVc. II, III, and IVd. I, III, IV, and VDescribe the mechanism of end point detection by EBT.