The specific rotation of (S)-2-butanol is +135 IF100 g of its enantiomer is dissolved in 100 ml of ethanol and placed in a sample cell with a length of 1.00 dm, what observed rotation do you expect? 0 (-13.5N0.100g/mL(1.00dm) --135 O (13.510 100g/m(1.00dm] = 135 0 (-135/10.100gml}{1.00dm] = -135 O (135)0.100g/mL(1.00dm) 135
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- The specific rotation of (S) butanol is +13.5 if 1.00g of its enantiomer is dissolved in 10.0mL of ethanol and placed in a sample cell with a length of 1.00 dm, what observed rotation do you expect?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(-)-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.
- 1. A solution of (S)-2-butanol (molar mass = 74.12) is observed to have a rotation in a 10 cm path length of +16.2 degrees. If the molar specific rotation of (S)-2-butanol is +135.2 degrees, what is the concentration of (S)-2-butanol in grams per liter? 2. After an attempt to resolve a racemate into its enantiomers, the observed rotation is +22.4 degrees per g/L. If the known specific rotation is +24.2 degrees per g/L,, what is the % enantiomeric excess of the compound? 3. If the % enantiomeric excess of a chiral compound is 88.2%, what is its chiral purity?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?Consider a solution made up of 90% R and 10% S. What is the enantiomeric excess (ee%) of the R enantiomer?
- When 4.35 g of menthol is dissolved in 3.20 mL of ether and placed in a sample cell 1 dm in length, the observed rotation at 20 degrees celcius using the D line of sodium is 49.25 degrees. Calculate the specific rotation of menthol.To the right are two enantiomeric natural products with vastly different olfactory properties. I find this example of enantiomeric pairs particularly intriguing, as I love caraway and rye but loathe searment: Answer the questions below with the understanding that an optically pure solution of the (-)-enantiomer of carvone rotates light counterclockwise 60*. a. what would be the observed optical rotation of a solution comprised of a 3:1 ratio of the (+) to (-) enantiomers of carvone? b. a different solution of both carvone enantiomers exhibits an observed optical rotation of -10*. determine the enantiomeric excess for this solution. c. which enantiomer (R or S) is in excess in the solution from (b)? how do you know? d. using your answer (b) above, calculate the actual percentages of each enantiomer in the solution.0.5 g of optically-enriched (-)-mandelic acid was dissolved in 10 mL of absolute ethanol. Using a 1 dm polarimeter tube, the observed optical rotation was found to be -6.8°. What is the specific rotation?
- a. The specific rotation for pure R is +5.0, what percentage of the mixture is R when the observed roation is -2.0. b. The rotation for pure S=-100. What is the observed rotation of a mixture that is 20%S and 80%R? I need an easy way to solve these kinds of problem, please!!An attempt at synthesizing a certain optically-active compound resulted in a mixture of its enantiomers. The mixture had an observed specific rotation of +11.5°+11.5°. If it is known that the specific rotation of the ?R enantiomer is −38.0°−38.0°, determine the percentage of each isomer in the mixture.Assign R or S configurations to each stereogenic center of isoborneol and borneol. Give the relationship between these two stereoisomers.