Calculate the specific rotation of a mixture of 94 % (+)-tartaric acid and 6 % (-)-tartaric acid. Express your answer with the appropriate units.
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- (+)-Mandelic acid has a specific rotation of +158o. What would be the observed rotation of a mixture containing 45% (-)-mandelic acid and 55% (+)-mandelic acid?Considering the observed rotation value indicated in the table, and considering that the measurement of this rotation wasperformed in a 4dm tube, from a 1g/ml solution, calculate: Show calculations a-Specific rotation of this compound. b-Rotation observed for a mixture in which the excessenantiomer of the enantiomer of the substance of the utterance was 50%. observed rotation: +40A natural product was isolated in the laboratory, and its observed rotation was +10° when measured in a 1 dm sample tube containing 1.0 g of compound in 10 mL of water. What is the specific rotation of this compound?
- 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!!What is the enantiomeric excess (ee) of a sample of mendalic acid with a specific rotation of +50, when pure (R)-mendelicacid has a specific rotation of -154. What is the composition of the sample in R and S isomers?(+)-Tartaric acid has a specific rotation of +12.0°. Calculate the specific rotation of a mixture of 68% (+)@tartaric acid and 32% (-)@tartaric acid
- 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?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.Calculate the specific rotation of a pure sample of a secondary alcohol that gave an observed rotation of + 15.8o in a cell 20.0 cm long. The density of alcohol is 0.848 g / mL.
- please help with these isomere types and indicate what is the cause of that relationship! (barrier to free rotation or asymmetric center)!PLEASE HELP WITH ALL! Thanks!!!If the optical rotation of a pure enantiomer A is +10 and the optical rotation of a mixture of two enantiomers (A+B) is -4 (Negative 6), what is the percentage of A and B in that mixture?After an attempt to resolve a racemate into its entantiomers, 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 compund?