The optical rotation of a sample composed only (S)-1-amino-1-phenylethane is determined. [a]obs = -157.0 degrees. If the cell path length was 1.0 dm and the concentration of (S)-1-amino-1-phenylethan in the sample was 5.2 g/mL, what is the specfic observed rotation? Choose the best answer.
a) -16.1 degrees
b) -30.2 degrees
c) -35.8 degrees
d) -43.2 degrees
e) -56.1 degrees