Specific Rotation of (-)-epinephrine/ and Calculation of enantiomeric excess

1. A solution of 0.5g (-)-epinephrine dissolved in 10mL of dilute HCl was placed in a 20-cm polarimeter tube.  Its optical rotation in sodium line (light wavelenth) was -5.0 degrees at 25 degrees Celsius.  What is the specific rotation of the (-)-epinephrine?


2. Calculate the enantiomeric excess (e.e.), a measure of optical purity of a substance, and the specific rotation of a mixture containing 6g of (+)-2-butanol and 4g of (-)-2-butanol.