need help !!

Stereochemistry Worksheet 2 1. Determine the stereochemistry of the following compounds (R,S or E,Z), E. F. H. I. 2. Are the following pairs identical or enantiomers. A. c. 3. EXTRA CREDIT: If a sample of mixed enantiomers has specific rotation []=100, and a pure enantiomer has a specific rotation []=200, what is the % of each enantiomer? 4. EXTRA CREDIT: If a sample has a specific rotation []=60 and a pare enantiomer has a specific rotation []150, what is the % of each enantiomer