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The optical rotation of a sample composed of only D-lactose is determined [a]abs = 0.99 degrees. [a]D is known to be 52.3 degrees for D-lactose. If the cell path length was 0.8 dm and the concentration of D-lactose in the sample was 0.17 g/mL, what is the enantiomeric excess (ee)?

a) 8.7%

b) 13.9%

c) 14.5%

d) 22.3%

e) 28.7%

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