(+)-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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- a) 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(+) 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 % (-) chloramphenicol
- 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?
- Naproxen, 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?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? 9H. В A (a) Assign the configuration (R or S) of each chirality center (labeled A to C) in coibacin B. (b) Identify the number of possible stereoisomers for this compound, assuming that the geometry of the alkenes are fixed. Choices are given below and write the CAPITAL LETTER of your choice. А. 2 В. 4 C. 8 D. 16