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A Pure Sample of the R Enantiomer of a Compound

Question 60

Multiple Choice

A pure sample of the R enantiomer of a compound has a specific rotation, [α], of +20°. A solution containing 0.2 g/mL of a mixture of enantiomers rotates plane polarized light by −2° in a 1 dm polarimeter. What is the enantiomeric excess (%ee) of the mixture?


A) 25% R
B) 40% S
C) 50% S
D) 70% R

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