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An attempt at synthesizing a certain optically active compound resulted in a mixture of its enantiomers....

An attempt at synthesizing a certain optically active compound resulted in a mixture of its enantiomers. The mixture had an observed specific rotation of 17.0°. If it is known that the specific rotation of the R enantiomer is –34.7°, determine the percentage of each isomer in the mixture.

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Answer #1

The specific rotation of R enantiomer has negative sign. The observed specific rotation for mixture has positive sign. Hence, S enantiomer has higher percentage than R enantiomer.

The enantiomeric excess

The percentage of S enantiomer

The percentage of R enantiomer

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