If 16.7 mg of sunscreen dissolved in 25 mL of 2-propanol. After this diluted this stock solution by a factor of 10 and measured the UV-Vis absorption of this diluted sample as 0.54. What is the absorbance/mg of the sunscreen used?
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If 16.7 mg of sunscreen dissolved in 25 mL of 2-propanol. After this diluted this stock solution by a factor of 10 and measured the UV-Vis absorption of this diluted sample as 0.54. What is the absorbance/mg of the sunscreen used?
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- A student dissolved 16.7 mg of sunscreen in 25 mL of 2-propanol. They then diluted this stock solution by a factor of 10 and measured the UV-Vis absorption of this diluted sample as 0.54. What is the absorbance/mg of the sunscreen the student used?A calibration plot of absorbance vs concentration (ppm) was obatined with standard known Red 40 dye solution. - the slope of the best-fit straight line of the plot is 0.057 ppm^-1 - The absorbance of the dilute unknown sports drink was 0.88 What is the concentration of this dilute unknown sports drink?______ the answer is 15.4 ppm ( can you please show me how to calculate this problem)In 250 ml ethanol solution, a tablet of saccharin was dissolved, and it was measured by UV spectrometer at a wavelength of 310 nm. The absorption was 0.45, the cell length was 1 cm, and the molar absorptivity was 12500. Calculate: the concentration of saccharin in the solution?
- You have a solution with a concentration of 0.80 mM, and you put it in a cuvette with a 1.0cm pathlength. You read an absorbance of 0.400. What is the extinction coefficient of your analyte? Question 4 options: 0.50 mmole/L/cm 0.50 mmol/L (cm)-1 0.50 L/mmole/cm 0.50 mM cmWhat is the percent transmittance (%) if the absorbance (A) is 0.774? Show your solutionA solution prepared by dissolving 25.8 mg of benzene (C6H6, FM 78.11) in hexane and diluting to 250.0 mL has an absorption peak at 256 nm, with an absorbance of 0.266 in a 1.000-cm cell. Hexane does not absorb at 256 nm. Find the molar absorptivity of benzene at this wavelength.
- A 0.1 g amine-containing compound is dissolved in water then diluted to 100 mL. To get the concentration of amine in this compound, you subject it to spectroscopic analysis. So, you get 1 mL of the previously diluted sample then dilute it again to 250 mL for measurement. Then, you fill 3/4 of a 1-cm cuvette with this diluted sample then you run an analysis using an AAS. The recorded absorbance is 0.545 at 410 nm. Solve for the molecular weight of the compound. The molar absorptivity is 1.23 x 104 cm-1 mol-1 L.Compound X was dissolved in a 5-mL volumetric flask. A 1.00-mL aliquot of the compound was placed in a 10-mL volumetric flask and diluted to the mark. The solution was read in a UV-Vis spectrophotometer and an absorbance of 0.427 in a 1.000-cm cuvette was observed at 340 nm. Solve the following question. Data for Compound X:Molecular mass = 292.16 g/molMolar absorptivity (ɛ) at 340 nm= 6130 M -1 cm -1 a. Calculate the concentration of compound X in the cuvette. b. How many milligrams of compound X were used to make the 5-mL solution?Compound X was dissolved in a 5-mL volumetric flask. A 1.00-mL aliquot of the compound was placed in a 10-mL volumetric flask and diluted to the mark. The solution was read in a UV-Vis spectrophotometer and an absorbance of 0.427 in a 1.000-cm cuvette was observed at 340 nm. Solve the following question. Data for Compound X:Molecular mass = 292.16 g/molMolar absorptivity (ɛ) at 340 nm= 6130 M -1 cm -1 1. What was the concentration of compound X in the 5-mL flask?
- A. Copper sulfate pentahydrate is often used to teach students about Beer’s Law by making a standard curve (linear regression). The bright blue color of the solution has a peak absorbance in the red range of the electromagnetic spectrum. The absorbance value is proportional to concentration. How many grams of CuSO4 5H2O to make up 250 mL of a 0.2 M stock of this solution? B. Using M1V1 = M2V2 how many mL would a student need to measure out in graduated cylinder to make up a 50 mL (V2) solution of 0.1M, 0.05 M, 0.025M 0.0125M solutions for a standard curve at the peak wavelenth for this compound?A. Copper sulfate pentahydrate is often used to teach students about Beer’s Law by making a standard curve (linear regression). The bright blue color of the solution has a peak absorbance in the red range of the electromagnetic spectrum. The absorbance value is proportional to concentration. How many grams of CuSO4 5H2O to make up 250 mL of a 0.2 M stock of this solution? B. Using M1V1 = M2V2 how many mL would a student need to measure out in graduated cylinder to make up a 50 mL (V2) solution of 0.1M, 0.05 M, 0.025M 0.0125M solutions for a standard curve at the peak wavelenth for this compound? I need help with part B of this question.You have a concentrated sample solution of a new wine from a winery to analyze for malic acid content. once you have worked up the sample and done one 5x dilution you record an absorbance of .395 at the analytical wavelength of the malic acid. the molar absorptivity coefficient E of the malic acid for this method of measurement is 15.84 mM-1cm-1. What was the molarity of malic acid in original wine sample mM?