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Q: 4. 1.00 g of sample is dissolved in 20.0 mL of ethanol. Then 5.00 mL of this solution is placed in a…
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Find the optical purity of a sample that has an observed rotation of +4.5o and a specific rotation of +66o.
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- 6. Calculate the specific rotation of a 1.00 g sample dissolved in 20.0 mL of ethanol when 5 mL of this solution are placed in a 200 cm polarimeter tube. The observed rotation is 1.25° counterclockwise.Calculate the specific rotation of a pure sample of a secondary alcohol that gave an observed rotation of + 15.8o in a cell 20.0 cm long. The density of alcohol is 0.848 g / mL.Calculate the specific rotation of a solution of a compound (30.0 g/100 mL of solution) that has a measured rotation of +25.25º in a 2.00 dm tube.
- The specific rotation of (R)-2-butanol is 13.5° counterclockwise. A sample containing (R)-2-butanol was made by dissolving 1.75 g into a solution with a total volume of 3.55 mL. The light source was a sodium D line and the temperature was 25° C. The length of the sample tube was 12.5 cm. What was the observed rotation of the sample? "Use three significant figures for your answer and the correct sign.Calculate the specific rotations of the following samples taken at 25 °C using the sodium D line.1.00 g of sample is dissolved in 20.0 mL of ethanol. Then 5.00 mL of this solution is placed in a 20.0-cm polarimeter tube. The observed rotation is 1.25° counterclockwise.(iii) Calculate the specific rotation of each enantiomer in a mixture containing 10 mL (0.10 M) of (2S, 3R, 5S) enantiomer and 30 mL (0.10 M) of (2R, 3S, 5R) enantiomer. Given the specific rotation of the mixture = +4.8°.
- The optical rotation of a sample was found to be 0.24° when the concentration was 0.60 g in 10 mL of chloroform and the path length of the cell in the polarimeter was 5 cm. What is the specific rotation for this sample?Calculate the specific rotation of the (S)-ibuprofen sample and (R)-ibuprofen sample based on the data given in the image attached? C=25ml and length= 1dmA new chemical reaction produced a mixture of two enantiomers. When 9.0 g of this mixture was dissolved in 50.0 mL of CH2Cl2 in a sample cell 20 cm long, the optical rotation was found to be +18.0º. The known specific optical rotation of one of the enantiomers is –74.0. What was the percentage of the (+) and (–) enantiomers produced by the reaction
- 13. You are given the following data for the stereoisomer shown. You have a sample of this molecule that has a measured optical rotation identical to this data. Which of the following statements do you know are TRUE? Br [a] = -23.1 O A. A sample with an optical rotation of -13.1 has an enantiomeric excess of the S isomer. O B. A sample with a 75% of the S sample and a 25% of the R sampleA 1.25 g sample of coniine, the toxic extract of hemlock, was dissolved in ethanol and placed in a sample cell with a 5.00 cm pathlength. The observed rotation at the sodium D line was +1.21° and [a]pwas +19.4°. Calculate the volume of ethanol us dissolve the sample. O a. 5.0 mL O b. 10.0 mL O c. 20.0 mL O d. 15.0 mL Save Answer A 1.25 g sample of coniine, the toxic extract of hemlock, was dissolved in ethanol and placed in a sample cell with a 5.00 cm pathlength. The observed rotation at the sodium D line was +1.21° and [a]pwas +19.4°. Calculate the volume of ethanol us dissolve the sample. Oa. 5.0 mL Ob. 10.0 mL Oc. 20.0 mL O d. 15.0 mL Save Answer A 1.25 g sample of coniine, the toxic extract of hemlock, was dissolved in ethanol and placed in a sample cell with a 5.00 cm pathlength. The observed rotation at the sodium D line was +1.21° and [a]pwas +19.4°. Calculate the volume of ethanol us dissolve the sample. Oa. 5.0 mL O b. 10.0 mL O c. 20.0 mL O d. 15.0 mL Save Answer5. Explain the following terms. a) Calibration curves b) Chromophores
