15.0 g of a known pure sample of quinine harvested from cinchona bark is dissolved in the ethanol to produce the 50.0 mL of solution at 25°C. When placed in a 10.0 cm path length cell, the solution rotates light of a sodium lamp - 43.6°. A sample of quinine produced in the laboratory is a racemes mixture .Resolution of this mixture results in 6.50 g of product that, when dissolved in ethanol to form 25.0 mL of solution, shows an optical rotation of-22.0° determine the enantiomeric excess of the levorotatory isomer in the partially resolved sample?