(25) For pure water and thermal energy neutrons: a) What are the absorption, scattering, and total macroscopic cross sections and the corresponding mean free paths? b) If 5 weight percent of natural boron is added to the water and the resulting density is 1.05 g/cc, calculate the absorption, scattering, and total macroscopic cross sections and the corresponding mean free paths. c) Calculate the average molecular weight of the water/boron mixture