Question 1 1 pts The specific rotation of a pure substance is -5.90°. What is the percentage of this isomer in a mixtur...
If a pure R isomer has a specific rotation of – 106.0°, and a sample contains 79.0% of the R isomer and 21.0% of its enantiomer, what is the observed specific rotation of the mixture? Number [a] = 10
If a pure R isomer has a specific rotation of –136.0°, and a sample contains 65.0% of the R isomer and 35.0% of its enantiomer, what is the observed specific rotation of the mixture?
if a pure R isomer has a specific rotation of -106.0, and a sample contains 70.0% of the R isomer and 30.0% of it's enantiomer, what is the observed specific rotation of the mixture
Consider a solution that contains 63.0% R isomer and 37.0% S isomer. If the observed specific rotation of the mixture is –59.0°, what is the specific rotation of the pure R isomer?
8. Sucrose has a specific rotation of +65.5 at 25°C. A solution of 4.62g of an unknown pure substance in 10 mL ethanol shows an observed rotation of +20.4 in a cell with a 10 em path Tength. Is it possible that the substance is sucrose? Show all your calculations for complete credit. (4 pts)-A- 2nd.. 20:t_r4个1558
8. Sucrose has a specific rotation of +65.5 at 25°C. A solution of 4.62g of an unknown pure substance in 10 mL ethanol...
Answer each of the following eleven multiple answer questions on the 11.(33) answer sheet. Each of the questions is 3 points. 1. The specific rotation of pure (+)-2-methyl-1-butanol is +5.90°. What is the specific rotation of a mixture containing 25% of this and 75 % of the (-)-isomer (a) +4.43° (b) +2.95° (c) -2.95° (d) 4.43° 2. Which of the following compounds is chiral? Cl (d) Cl (b) Cl (c) (a) CH3 CH3 CH3 Cl CH3 н Cl CH2B Br...
7 (7 pts) The specific rotation, (a), of an optically pure natural product 15 compound we made in the lab was prepared by diluting 12.55 grams of it in a 30.0 cm polarimeter tube. pure natural product is -65.0°. A sample of the same uuting 12.55 grams of it into 40.0 ml of ethanol and placed A) Our compound was found to have an "ee" of 80% - What was the specific totam % - What was the specific rotation...
09 Homework . Unanswered The specific rotation of L-dopa in water is -39.5. The specific rotation of a solution of L-dopa and its enantiomer was determined to be -19.75. Calculate the % ee of this mixture. O A 15% 0 B 25% To a 50% 1 OD 75% O E 80% Unanswered
The specific rotation [a] of pure quinine is -165º. A solution containing both quinine and its enantiomer has a specific rotation of -63º. Calculate the percentage of quinine present in the mixture? (show calculations; 0.3 pts) HO LN HC quinine % quinine =
2. The optical activity, measured by specific rotation, of pure (R-malic acid is [a]20D-+27% What is the specific rotation of a mixture of 50% and 50% of (R)-malic acid and (S)-malic acid? What is enantiomeric excess of a sample of malic acid containing both enantiomers that has a [al20D -0% [a]20D-27"; [a]20D-_ 13.5": [a]20D-+ 13.5°