A pure sample of the amino acid (S)-phenylalanine has a specific rotation of
+70°. A mixture of the two enantiomers of phenylalanine (S and R) has a specific rotation of -17.5°.
What are the percentages of the S and R enantiomers in the mixture?
55.5% S, 44.5% R
50 % S, 50% R
37.5% S, 62.5% R
95% S, 5% R