ibuprofen is a drug used to manage mild pain, fever, and inflammation. it is a chiral drug, and only the (s) enantiomer, whose specific rotation is 25.0o, is effective. the (r) enantiomer exhibits no biological activity. if a particular process is capable of producing ibuprofen in 84% enantiomeric excess (ee) of the (s) enantiomer, then what is the specific rotation of that mixture? what is the percentage (s) enantiomer in that mixture?