In his classic studies of stereochemistry and optical activity in organic compounds, Pasteur measured the optical activity of many solutions. For the naturally occurring enantiomer of tartaric acid, [a],20 = +12.4°. What is the % of the (+)-enantiomer in the mixture if the observed rotation is a = -6.0°, with a concentration of 0.54 g/mL in a 2.00 dm polarimeter tube? A. 25.8% B. 27.6% C. 44.8% D. 72.4% E. 74.2% A O B D O E

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