At the equilibrium of the reaction, N2O4 (g) 2 NO2 (g), the observed molecular weight of N2O4 is 80 g mol –1 at 350 K. The percentage of dissociation of N2O4 (g) at 350 K is

Observed molecule weight =80g/mol Normal molecular weight of 2 4 N O =92g/mol Van’t Hoff factor 92 1.15 80 i Degree of dissociation i 1 1.15 1 n 1 2 1 0.15 2 4 Percentage dissociation of N O 0.15 100 15% x