An attempt at synthesizing a certain optically-active compound resulted in a mixture of its enantiomers. The mixture had an observed specific rotation of +14.2°. If it is known that the specific rotation of the R enantiomer is -31.0°, determine the percentage of each isomer in the mixture. R enantiomer: S enantiomer:
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- A pure sample of the R isomer of a particular compound is known to have a specific rotation of -40. A mixture of the two enantiomers of the compound gives a specific rotation of +8. What are the percentages of the S and R enantiomers in the mixture?2. A mixture of two enantiomers has as observed rotation of -18°. The specific rotation of the (-)enantiomers is -27°. Find the % of the two enantiomers in the solution.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.
- A 0.26 M solution of an enantiomerically pure chiral compound D has an observed rotation of +0.197° in a 1‑dm sample container. The molar mass of the compound is 132.3 g/mol. a. What is the specific rotation of D? b. What is the observed rotation if this solution is mixed with an equal volume of a solution that is 0.26 M in L, the enantiomer of D? c. What is the observed rotation if the solution of D is diluted with an equal volume of solvent?The specific rotation of (R)carvone is -61o. A chemist prepared a mixture of (R)-carvone and (S)-carvone, and the mixture had an observed rotation of -47o. What is the % enantiomeric excess (ee) of the mixture?pure (S) enantiomer has a specific rotation of -63deg, what is the specific rotation of the mixture if a racemic mixture of (30g) was treated with chiral reagent to separate the (R) enantiomer?
- If the sample of the pure R enantiomer of a molecule has a specific rotation of -40 degrees and your mixture of that molecule has an 82% ee S, what is the observed specific rotation of your sample?The [α] of a pure enantiomer is -39°. The observed rotation of a sample containing both enantiomers was found to be -0.62°. a) Calculate the enantiomeric excess (e.e %) b) Calculate the percent of each enantiomer present.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?
- A solution prepared by mixing 10 mL of a 0.10 M solution of the R enantiomer of a compound and 30 mL of a 0.10 M solution of the S enantiomer was found to have an observed specific rotation of +4.8. What isthe specific rotation of each of the enantiomers? (Hint: mL * M = millimole, abbreviated as mmol)Suppose a solution of a compound gave a rotation of +160o. How could this rotation be distinguihed from one of -200oand from one of +520o?The specific rotation (s) carvone (at 20°C) is +61. A chemist prepared a mixture of (R) carvone and its enantiomer, and this mixture had an observed rotation of -55. What is the specific rotation of (R)-carvone at 20°C?