The average molar mass M of equilibrium mixtures of NO2 and N2O4 at 1.013 bar total pressure is given in the table below at three temperatures. t/C 25 45 65 M/gmol-1 77.64 66.80 56.51 (a) Calculate the degree of dissociation of N2O4 and the equilibrium constant at each of these temperatures. (b) Graphically determine the enthalpy for the dissociation of N2O4. (c) Calculate the equilibrium constant at 35 C. (d) Calculate the degree of dissociation for N2O4 at 35 C