poly(methyl methacrylate) (pmma) has a characteristic ratio of , a kuhn length nm, a kuhn molar mass g/mol, a monomer molar mass of 100 g/mol, and a c-c bond length of nm. a sample of pmma has found to have an average molar mass of 120,000 g/mol. calculate its mean squared end-to-end distance using the equivalent fjc for pmma.