An ethanol solution of 3.5 mg/100 ml of compound Y (150.0 g/mol) in a 1.00 cm quartz cell has an absorbance (A) of 0.972 at λmax=235 nm. What is its molar extinction coefficient?
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An ethanol solution of 3.5 mg/100 ml of compound Y (150.0 g/mol) in a 1.00 cm quartz cell has an absorbance (A) of 0.972 at λmax=235 nm. What is its molar extinction coefficient? Report your answer to the correct number of significant figures. Do not include units in your answer.©GMU 2020
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- A compound Y (150.0 g/mol) in a 1.00 cm quartz cell has an extinction coefficient (ε) of 23,150 at λmax=235 nm. What is the energy absorbed by the compound at the maximum of the peak? Note that hc=1.98644586×10−25J*m. Report your answer in KJ/mole to the correct number of significant figures. Do not include the units in your answer.An ethanol solution of 3.5 mg/100 ml of compound Y (150.0 g/mol) in a 1.00 cm quartz cell has an absorbance (A) of 0.972 at λmax=235 nm. What is its molar extinction coefficient? Report your answer to the correct number of significant figures. Do not include units in your answer.The nitrite in a series of standard solutions (mg/L, n = 5) are converted to azo dye and the slope of the calibration curve is 2.0 ppm1. A 10.00-mL mineral water sample is treated in the same way as standards and diluted to a final volume of 100.00-mL. It gives an absorbance of 0.80. The absorbance of blank solution under the same conditions is 0.10. Calculate ppm (mg/L) of NO2 (46 g/mol) and the molarity of NANO2 (69 g/mol) in the original sample
- 1.A compound Y (150.0 g/mol) in a 1.00 cm quartz cell has an extinction coefficient (ε) of 23,150 at λmax=235 nm. What is the energy absorbed by the compound at the maximum of the peak? Note that hc=1.98644586×10−25J*m. Report your answer in KJ/mole to the correct number of significant figures. Do not include the units in your answer 2.In general, we want to have absortions less than or equal to 1. What percentage of the incident light is transmitted when absorption is 1? Report your answer to the nearest whole number. 3.An ethanol solution of 3.5 mg/100 ml of compound Y (150.0 g/mol) in a 1.00 cm quartz cell has an absorbance (A) of 0.972 at λmax=235 nm. What is its molar extinction coefficient? Report your answer to the correct number of significant figures.The absorption coefficient of O2 in seawater at 0°C is 1.7 mmol/L.What is the concentration of O2 if the O2 partial pressure is 0.1atm? Express your answer first in mmol/L, then in mL/L.The standard curve was made by spectrophotographic analysis of equilibrated iron(III) thiocyanate solutions of known concentration. You are asked to analyze a Fe(SCN)2+Fe(SCN)2+ solution with an unknown concentration and an absorbance value of 0.4150.415 . The slope-intercept form of the equation of the line is ?=4558.4?+0.0147y=4558.4x+0.0147 . The unknown was analyzed on the same instrument as the standard curve solutions at the same temperature. What is the Fe3+Fe3+ concentration of the unknown solution?
- Maria was tasked to determine the concentration of a Fe2(SO4)3 solution. She prepared 5 different standards of Fe2(SO4)3 using the table below as her guide. She ran the standards and the unknown solution through UV-VIS spectroscopy and recorded the absorbances of each solution. What is the slope of the line of the standard curve from the given data? 0.3194 1.1385 0.3217 2.131In general, we want to have absorptions less than or equal to 1. Given that an ethanol solution of compound Y (150.0 g/mol) in a 1.00 cm quartz cell has an extinction coefficient (ε) of 23,150 at λmax=235 nm, what is the top concentration, in μM, we should consider for compound Y? Report your answer to the correct number of significant figures. Do not report the units in your answer.Topic: Transmittance and absorbance, lambert-beer law A 0.01 M solution in KCr (C2O4) 2 (H2O) 2 in a 1 cm cell absorbs half the radiation that a 0.001 M solution of Br2 in a 5 cm thick cell. At 250 nm the molar absorptivity coefficient for Bromine is 150. Calculate the coefficient of molar absorptivity of the oxalate complex.
- Calculate the molar extinction coefficient of a biomolecule with a MW of 300 if a 5.0 mM solution in a 1.2 cm cuvette has an absorbance of 0.50 at 340 nm.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?If the apparent molar absorptivity of cefuroxime sodium is 2.046 × 103 L mol−1 cm−1 in a 1-cm cuvette, at what concentration should the standard and sample solutions be prepared to result to an ideal absorbance value of 0.500? Show your solution.