The specific rotation for a pure enantiomer is known to be-45 g mL-1 dm-1. A sample containing both enantiomers is found to have an observed rotation of -0.50° in a 1dm tube at a concentration of 4.2g/100 mL. What is the optical purity of the sample?

The specific rotation for a pure enantiomer is known to be-45 g mL-1 dm-1. A sample containing both enantiomers is found to have an observed rotation of -0.50° in a 1dm tube at a concentration of 4.2g/100 mL. What is the optical purity of the sample?

Organic Chemistry

8th Edition

ISBN:9781305580350

Author:William H. Brown, Brent L. Iverson, Eric Anslyn, Christopher S. Foote

Publisher:William H. Brown, Brent L. Iverson, Eric Anslyn, Christopher S. Foote

Chapter3: Stereoisomerism And Chirality

Section3.7: Optical Activity—how Chirality Is Detected In The Laboratory

Problem 3.9P

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Question

The specific rotation for a pure enantiomer is known to be -45 g-
mL-1 dm-1. A sample containing both enantiomers is found to have
an observed rotation of -0.50° in a 1dm tube at a concentration of
4.2g/100 mL. What is the optical purity of the sample?
O a. 20.6%
Ob. 30.8%
Oc. 26.4%
O d. 36.5%

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