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Q: B. The specific rotation of a pure substance is -5.90°. What is the percentage of this isomer in a…
A: Rotation of pure substance, S = - 5.90◦ Observed specific rotation = - 2.95◦
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The specific rotation of (S)-2-iodobutane is +15.90°. Predict the specific rotation of (R)-2-iodobutane.
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- The specific rotation of (S)-2-iodobutane is +15.90°. Draw the structure of (S)-2-iodobutane.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?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?
- 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. 13.44An 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.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: % %
- 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 experimentallyThe specific rotation for (-)-methylphenidate is -38° mL g¹ dm¯1. Path length of the polarimeter is 1 dm. 1 You dissolve 0.5 g of a mixture of (-)-methylphenidate and its enantiomer in 4 mL of water. You place the sample into a polarimeter and the observed rotation is found to be -0.2°. What percent of the mixture is composed of (-)- methylphenidate? (Round your answer to the nearest whole percent.) The numerical values in this calculation will change with each attempt. Double check before submitting additional attempts. 17Identify the stereochemical configuration of this cyclic compound. CI R Os
- The specific rotation of optically pure adrenaline in water at 25°C is -53. If a chemist has a sample of synthetic adrenaline with a specific rotation of -45, calculate the enantiomeric excess.A 1.52 M solution of (R)-2-butanol is mixed with an equal volume of a 0.760 M solution of racemic 2-butanol, and the resulting solution is analyzed in a sample container that is 1 dm long. What observed rotation is expected? The specific rotation of (R)-2-butanol is -13.9 degrees mL g-¹ dm¯¹. α = degHexahelicene seems a poor candidate for optical activity because all its carbon atomsare sp2hybrids and presumably flat. Nevertheless, hexahelicene has been synthesized and separated into enantiomers. Its optical rotation is enormous: [a]D = 3700°.Explain why hexahelicene is optically active, and speculate as to why the rotation isso large