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# If a pure r isomer has a specific rotation of –147.0°, and a sample contains 61.0% of the r isomer and 39.0% of its enantiomer, what is the observed specific rotation of the mixture?

If a pure r isomer has a specific rotation of –147.0°, and a sample contains 61.0% of the r isomer and 39.0% of its enantiomer, what is the observed specific rotation of the mixture?