(+)-Tartaric acid has a specific rotation of +12.0°. Calculate the specific rotation of a mixture of 68% (+)-tartaric acid and 32% (-)-tartaric acid.
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- (+) Chloramphenicol is a powerful antibiotic isolated in 1949 from the Streptomyces venezuelae bacterium. Its specific rotation is +18.6°. What is the composition of a mixture of (+) and (-) chloramphenicol whose observed specific rotation is +14.88° ? Select one: A. 60% (+) chloramphenicol and 40 % (-) chloramphenicol B. 70% (+) chloramphenicol and 30 % (-) chloramphenicol C. 90% (+) chloramphenicol and 10 % (-) chloramphenicol D. 80% (+) chloramphenicol and 20 % (-) chloramphenicola) Draw the structure of the compound: (R) -1,1,2-trimethylcyclohexane. b) (+)-Oxalic acid has a specific rotation of +14.0°. Calculate the specific rotation of a mixture of 58% (+)-Oxalic acid and 42% (-)-Oxalic acid.CH-ST53 The specific rotation of dextrorotatory tartaric acid is +12.7 degrees. A mixture of dextrorotatory and levorotatory tartaric acid has a specific rotation of -6.35 degrees. What is the proportion of each compound in the mixture? O A. 25% of the dextrorotatory tartaric acid and 75% of the levorotatory tartaric acid O B. 33% of the dextrorotatory tartaric acid and 67% of the levorotatory tartaric acid OC. 50% of the dextrorotatory tartaric acid and 50% of the levorotatory tartaric acid O D.75% of the dextrorotatory tartaric acid and 25% of the levorotatory tartaric acid
- The pure D-form of a compound has a specific rotation (D line of sodium, 20° C) of +24°, whereas the pure L- form of the compound has a specific rotation (D line of sodium, 20° C) of -24°. If a scientist has a sample of this compound that is known to be 78% pure D-form (and, therefore, 100% - 78% pure L-form), what will be the observed rotation of this sample? Enter your answer to the nearest hundredth. The units are assumed to be degrees. 13.441) The specific rotation of pure (+)-carvone gives a specific rotation of +61.0°. Is this compound dextrorotatory or levorotatory? Is the compound R or S? 2) A sample of carvone was isolated from spearmint oil. The sample gave a specific rotation of 30.5°. a. What enantiomer is the major enantiomer present in spearmint oil? b. In the sample, what is % ee of the major enantiomer? c. In the sample, what is the total % of the major enantiomer? d. In the sample, what is the total % of the minor enantiomer? e. What part of the sample constitutes the racemic mixture of the enantiomers?13. If the proton-pump inhibitor, (S)-omeprazole, has a specific rotation (rotation of plane polarized light) of -155°, what should the specific rotation of (R)-omeprazole be? a) -155° b) 0° c) +155° d) It can only be determined experimentally
- A sample mixture containing the made-up enantiomers (R)-(+)-Nenamide and (S)-(-)-Nenamide has an apparent specific rotation of +6.50° at 25 °C. This sample has an enantiomeric excess (EE) of 43.0%. Provide answers to the following questions : 1.Which enantiomer is in excess in the sample? 2.What is the specific rotation of (S)-(-)-Nenamide?An attempt at synthesizing a certain optically-active compound resulted in a mixture of its enantiomers. The mixture had an observed specific rotation of +16.0°. If it is known that the specific rotation of the R enantiomer is -33.3°, determine the percentage of each isomer in the mixture. R enantiomer: S enantiomer: % %The specific rotation of (S)-carvone (at 20 degrees) is +61. A chemist prepared a mixture of (R)-carvone and its enantiomer, and this mixture had an observed rotation of -55. (a) What is the specific rotation of (R)-carvone at 20 degrees?
- C 23. a) The observed rotation for a solution containing the R and S enetaiomers a of a sample was +17.6. An enantiomerically pure sample of the S enantiomer has a specific rotation of + 22.3°. What is the % enantiomeric excess of sample A? b)A pure sample of the R-enantiomer of a compound has a specific rotation of -15°. A solution containing 0.6 g/mL of a mixture of enantiomers rotates plane polarized light by -3° in a 1 dm polarimeter. What is the enantiomeric excess (%ee) of the mixture? 9Naproxen, a nonsteroidal anti-inflammatory drug that is the active ingredient in Aleve, has a specific rotation of +66. One commercial preparation results in a mixture with a 97% enantiomeric excess. a. Does naproxen have the R or the S configuration? b. What percent of each enantiomer is obtained from the commercial preparation?(- )- Mandelic acid has a specific rotation of - 158°. What would be the specific rotation of a solution which contains 50% (- )- mandelic acid and 50% (+ )- mandelic acid? А. 0° В. + 79° O C. The value must be experimentally determined D. - 79°