(-)-Cholesterol has a specific rotation of -32o. A mixture of (+)- and (-)-cholesterol was analyzed by polarimetry, and the observed rotation was 14o. What is the percent composition of the (+) isomer in this mixture?Assume 1 g of sample was dissolved in 1 mL water and the sample cell was 1 dm long.
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(-)-Cholesterol has a specific rotation of -32o. A mixture of (+)- and (-)-cholesterol was analyzed by polarimetry, and the observed rotation was 14o. What is the percent composition of the (+) isomer in this mixture?Assume 1 g of sample was dissolved in 1 mL water and the sample cell was 1 dm long.
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- When 0.075g of penicillamine is dissolved in 10.0 mL of pyridine and placed in a sample cell 10.0 cm in length, the observed rotation at 20 degrees (using the D line of sodium) is -0.47 degrees. Calculate the specific rotation of penicillamine. a. (-0.47)/[(0.075g/mL) (1.00 dm)]= -6.3 b. (0.47)/[(0.075g/mL) (1.00 dm)]= 6.3 c. (-0.47)/[(0.0075g/mL) (1.00 dm)]= -63 d. (0.47)/[(0.0075g/mL) (1.00 dm)]= 63A solution is prepared by dissolving 678 mg of testosterone in 20 mL of ethanol. The sample was placed in a 10 cm long cuvette. The observed rotation of the sample at 25oC is + 13.8o. Calculate the specific turnover of testosterone, show the calculations.Viktor measures out 2.100 g of the ibuprofen from the bottle and dissolves it in 15.0 mL of ethanol. He transfers this solution to a 1.0 dm long tube and the polarimeter gives him a reading of +7.3416 deg for this sample. The literature specific rotation for ibuprofen is 57 deg. What is the observed specific rotation for this sample? What is the enantiomeric excess (EE) for this sample?
- 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.3.5 mg of optically-enriched (-) sugar P was dissolved in 1.00 mL methanol in a 1.00 mL volumetric flask. The optical rotation was found to be -0.0222° in a 5.0 cm cell. What is the specific rotation? Write out all your work and upload it here.Calculate the specific rotation of a substance that is dissolved in a solvent (0.4 g/mL) and that has an observed rotation of –10° as determined with a 0.5-dm cell.
- The specific rotation of (-) isomer is -22˚, with concentration of 4.2 g/100 mL, and pathlength of 0.5 dm. The specific rotation of (+) isomer is +17.4˚, with concentration of 4.0 g/100 mL, and pathlength of 0.5 dm. 1. Calculate the observed rotation of the (+) and (-) methylbenzylamine isomers, and explain that the polarimeter calculates the specific rotation 2. calculate %ee (enantiomeric excess) (allows for further discussion; attention to be paid to the accepted optical rotation to ensure that it is in the same particular solvent system)A mixture of the stereoisomers of glutamic acid has an observed rotation of +6°. The specific rotation of pure (R)-(–)-glutamic acid is –24°. Calculate (a) the enantiomeric excess, (b) the composition of the mixture, and (c) draw the 3D structure of the excess glutamic acid.7. A 0.5 gram sample of hoodia gordonii isolated from natural sources yields an observed rotation of -0.76° when dissolved in 20 mL of chloroform and placed in a 1-dm cell. Determine the specific rotation [α] of hoodia gordonii for: (a) the entities as defined above,(b) an increase in solute from 0.5g to 1.0 g;(c) an increase in solvent from 20 mL to 40 mL; and (d) an increase in path length from 1 dm to 2 dm. Does entities defined above refer to the picture since its a hoodia gordnii? I don't even know where to start with this one