20% of N2O4 molecules are dissociated in a sample of gas at 27ºC and 760 torr. Mixture has the density at equilibrium equal to

Degree of decomposition, α =M-mmn-1M = MW of undissociated speciesm = MW of equilibrium mixture (observed molecular weight)n = number of particles produced by the dissociation of one moleculeN2O4(g) ⇌2NO2(g)n = 2α = 0.2T = (27 + 273)KP = 760 torr (or) 1 atmObserved molecular weight = 76.66for an ideal gas, density (d)