(5%) (b) Calculate the enthalpy of mixing when 105 mol of poly(methyl methacrylate) of Mn = 105 g/mol and of p = 1.2 g/cm are dissolved in 150 g of CHC13 (p = 1.49 g/cm) at 20 C. Assume the volumes are additive and x = 0.377

(5\%) (b) Calculate the enthalpy of mixing when 105 mol of pory(xba) methacrylate) of Mn=105g/mol and of =1.2ggm3 are dissoleded in 150.8gof CHCl3(=1.49g/cm3) at 20C. Assume the volumes are ddtitive and y=0337