20. The specific rotation of (S)-alanine is +8.5°. If a mixture of alanine enantiomers is 80% S and 20% R, what is the specific rotation of mixture?
A) +14.17 B) -14.17 C) +10.62 D) +42.5
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20. The specific rotation of (S)-alanine is +8.5°. If a mixture of alanine enantiomers is 80%...
The specific rotation, (a)p, for (+)-alanine is +8.5. What is the observed rotation for a solution of 1.7 g of (+)-alanine in 10 mL of water in a sample tube having a pathlength of 10 cm? degrees The observed rotation of a solution of 1.3 g of a compound in 10 mL of water is +8.2 degrees. If the pathlength is 10 cm, what is the specific rotation of the compound? The specific rotation, (a)p, for(-)-pseudoephedrine is - 52. What...
5.54 The specific rotation of (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°. (a) What is the specific rotation of (R)-carvone at 20°C? (b) Calculate the % ee of this mixture. (c) What percentage of the mixture is (S)-carvone?
Problem 5.31 O The amino acid (S)-alanine has the physical characteristics listed under the structure. a. What is the melting point of (R)-alanine? b. How does the melting point of a racemic mixture of (R) and (S)-alanine compare OH to the melting point of (S)-alanine? NH c. What is the specific rotation of (R)-alanine, recorded under the same conditions (S)-alanine as the reported rotation of (S)-alanine? (a) 8.5 d. What is the optical rotation of a racemic mixture of (R)-...
3.34 The specific rotation of (S)-carvone (at +20°C) is +61. A chemist prepared a mixture of (R)- 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°C? (b) Calculate the % ee of this mixture. (c) What percentage of the mixture is (S)-carvone?
10. What is the specific rotation of a sample of carvone that is an equal mixture of the R and S enantiomers? (R)- carvone has a specific rotation of -61°. a. -61° b. 64° d. +61° c. 0° 11. What is the percentage of the R enantiomer in a sample of carvone that has a specific rotation of 30°, given that the specific rotation of (R)-carvone is -61°? (2 pt ... this is challenging.) a. 26% b. 51% c. 49%...
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An attempt at synthesizing a certain optically active compound resulted in a mixture of its enantiomers. The mixture had an observed specific rotation of +11.7. If it is known that the specific rotation of the R enantiomer is -38.9, determine the percentage of each isomer in the mixture. Number R enantiomer: % Number S enantiomer
If a reaction provides a racemic mixture of S and R enantiomers, what will be the optical rotation of a 0.3 M solution in CH2Cl2?