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.
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- 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 % of L-dopa in the solution. Select an answer and submit. For keyboard navigation, use the up/down arrow keys to select an answer. a b с d e 15% 25% 50% 75% 80%What is the enantiomeric excess of a solution with a specific rotation of - 90 degree where the pure solution rotates at -135 degree? * 13.33% O 66.67% O None of the above 33.33%Viktor measures out 2.100 g of the ibuprofen from the bottle and dissolves it in 15.0 mL of ethanol. He transfers this solution to a 1.0 dm long tube and the polarimeter gives him a reading of +7.3416 deg for this sample. The literature specific rotation for ibuprofen is 57 deg. What is the observed specific rotation for this sample? What is the enantiomeric excess (EE) for this sample?
- 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?How can we decide whether an observed rotation of a solution of an optically active compound is +170° and not actually -190°?When one of the enantiomers of butan-2-ol is placed in a polarimeter, the observed rotation is 4.05° counterclockwise. The solution was made by diluting 6.00 g of butan-2-ol to a total of 40.0 mL, and the solution was placed into a 200-mm polarimeter tube for the measurement. Determine the specific rotation for this enantiomer of butan-2-ol.
- When 0.066 g of cholesterol is dissolved in 1.00 mL of ether and placed in a sample cell 10.0 cm in length, the observed rotation 20°C (using the D line of sodium) is -0.208°Calculate the specific rotation of cholesterol. specific rotation [a] = i eTextbook and MediaThe specific rotation for D-glucose is 52.70⁰. In a mixture of D- and L-glucose, you measure an observed rotation that has a negative value. You calculate the % ee of the mixture to be 55%. What is the molecular composition of your mixture? (if you are lost here, watch the video, or look in your Technique Manual for guidance) 55% D, 45% L-glucose 45% D, 55% L-glucose O 77.5% D, 22.5% L-glucose 22.5% D, 77.5% L-glucose4 What are enantiomers? What instrument can you use to distinguish the enantiomers? What is racemic mixture? What is enantiomeric excess (e.e)? 5 For a chiral compound with 2 chiral centers how many configurations (also called isomers in lose sense) are possible. Use 2¹ rule. 6 Pure (R)- lactic acid has rotation of + 12.31º. A mixture of lactic acid has a specific rotation of +2.71º. Determine the percent composition of two enantiomers (R) and (S) in the mixture.
- The specific rotation of vitamin C ( using the D line of sodium, at 20°C) is +24. Predict what the observed rotation would be for a solution containing 0.100 g of vitamin C dissolved in 10.0 ml of ethanol and placed in a sample cell with a length of 1dm.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)6. What is the enantiomeric excess in a sample with a 1:1.2 mixture of R:S enantiomer