Measurements on dilute solutions of polyisobutylene (monomer molecular mass of 56 g mol−1 ) in chloroform (at T = 298 K) give the Staudinger index [η] data in the table. Analyze these data to determine the mean square end-to-end distance of the polymer chains and the statistical length of a chain element (Monomer length = 252 pm). [η]/ mL g-1 29.3 38.8 65.7 107.9 M/ kg mol-1 57.1 95.0 247 610