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Enantiomeric Excess Solutions Library

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13 solutions

Enantiomeric Excess

Q.  A mixture of equal amounts of two enantiomers a. is optically inactive. b. is called a racemic mixture.c. implies that the enantiomers are meso fo...

Solved • Apr 17, 2019

Enantiomeric Excess

Q. Consider a solution that contains 74.0% R isomer and 26.0% S isomer. If the observed specific rotation of the mixture is -88.0°, what is the specif...

Solved • Oct 23, 2018

Enantiomeric Excess

Q. If a pure R isomer has a specific rotation of -151.0°, and a sample contains 69.0% of the R isomer and 31.0% of its enantiomer, what is the observe...

Solved • Oct 23, 2018

Enantiomeric Excess

Q. If a sample contains 64.0% of the R enantiomer and 36.0% of the S enantiometer, what is the enantiomeric excess of the mixture? % enantiomeric exce...

Solved • May 29, 2018

Enantiomeric Excess

Q. One of the following isn't true about a racemic mixture. a) It is optically inactive b) It has equal amounts of enantiomers c) It doesn't rotate...

Solved • Feb 20, 2017

Enantiomeric Excess

Q. When 0.300 g of glucose is dissolved in 10.0 mL of water and placed in a sample cell 10.0 cm in length, the observed rotation is +3.1°C. Calculate ...

Solved • Sep 15, 2016

Enantiomeric Excess

Q. 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 obse...

Solved • May 31, 2016

Enantiomeric Excess

Q. When 0.075 g of penicillamine is dissolved in 10.0 mL of pyridine and placed in a sample cell 10.0 cm in length, the observed rotation at 20°C (usi...

Solved • May 27, 2016

Enantiomeric Excess

Q. Determine whether each statements is true or false: (a) A racemic mixture of enantiomers is optically inactive. 

Solved • May 27, 2016

Enantiomeric Excess

Q. You are given a solution containing a pair of enantiomers  (A and B). Careful measurements show that the solution contains 98% A and 2% B. What is ...

Solved • May 27, 2016

Enantiomeric Excess

Q. Which statement is true? a) Compounds with R stereocenters rotate plane-polarized light clockwise.  b) For equal concentrations and equal path le...

Solved • Apr 24, 2016

Enantiomeric Excess

Q. Pure (S)-2-butanol has a specific rotation of +13.5 degrees. You have made and purified a sample that has a calculated specific rotation of -6.76 d...

Solved • Feb 22, 2016

Enantiomeric Excess

Q. Compound C has an [a] D = +28°.a) Draw the structure of compund D, which is isomer of C and features an [a]  D = -28°.b) Calculate the [a] D of  a ...

Solved • Feb 19, 2016