64. How much of the R enantiomer is present in 10 g of a mixture which has an enantiomeric excess of 30% of the S isomer? A) 3.0 g B) 3.5 g C) 6.5 g D) 7.0 g 65. A solution containing 0.4 g/mL of a pure S enantiomer is a 1 dm polarimeter rotates plane polarized light by +5.6°. What is the rotation of a solution containing 0.8 g/mL of the S enantiomer in the same polarimeter. A) +5.6° B) +11.2° C) +2.8° D) +1.4° 66. What is the percent ee of a mixture that has 70% of one enantiomer and 30% of the other? A) 70 B) 85 C) 40 D) 30 67. If a mixture has an ee of 90%, what is the percentage of each enantiomer? A) 65% : 35% B) 55% : 45% C) 80% : 20% D) 95% : 5%
64. How much of the R enantiomer is present in 10 g of a mixture which has an enantiomeric excess of 30% of the S isomer? A) 3.0 g B) 3.5 g C) 6.5 g D) 7.0 g 65. A solution containing 0.4 g/mL of a pure S enantiomer is a 1 dm polarimeter rotates plane polarized light by +5.6°. What is the rotation of a solution containing 0.8 g/mL of the S enantiomer in the same polarimeter. A) +5.6° B) +11.2° C) +2.8° D) +1.4° 66. What is the percent ee of a mixture that has 70% of one enantiomer and 30% of the other? A) 70 B) 85 C) 40 D) 30 67. If a mixture has an ee of 90%, what is the percentage of each enantiomer? A) 65% : 35% B) 55% : 45% C) 80% : 20% D) 95% : 5%
Biochemistry
9th Edition
ISBN:9781319114671
Author:Lubert Stryer, Jeremy M. Berg, John L. Tymoczko, Gregory J. Gatto Jr.
Publisher:Lubert Stryer, Jeremy M. Berg, John L. Tymoczko, Gregory J. Gatto Jr.
Chapter1: Biochemistry: An Evolving Science
Section: Chapter Questions
Problem 1P
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please answer all 64-67
Transcribed Image Text:64. How much of the R enantiomer is present in 10 g of a mixture which has an
enantiomeric excess of 30% of the S isomer?
A) 3.0 g B) 3.5 g C) 6.5 g D) 7.0 g
65. A solution containing 0.4 g/mL of a pure S enantiomer is a 1 dm polarimeter rotates
plane polarized light by +5.6°. What is the rotation of a solution containing 0.8 g/mL of
the S enantiomer in the same polarimeter.
A) +5.6° B) +11.2° C) +2.8° D) +1.4°
66. What is the percent ee of a mixture that has 70% of one enantiomer and 30% of the
other?
A) 70 B) 85 C) 40 D) 30
67. If a mixture has an ee of 90%, what is the percentage of each enantiomer?
A) 65% : 35% B) 55% : 45% C) 80% : 20% D) 95% : 5%
ее
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