Ammonium carbamate when heated to 200ºC gives a mixture of NH3 and CO2 vapour with a density of 13. What is the degree of dissociation of ammonium carbamate?

Ammonium carbamate is NH4COONH2 MW of NH4COONH2 (undissociated) = 78VD of NH4COONH2 (undissociated) = 39VD of equilibium mixture (observed vapour density) = 13Degree of decomposition,α=D-dd(n-1)D = V.D of undissociated speciesd = V.D of equilibrium mixture (observed vapour density)NH4COONH2(s)⇌2NH3( g)+CO2( g)n = 3D = 39d = 13α=D-dd(n-1) α=39-1313(3-1) α=2626 α=1