Mavg=2×Vapordensity=76.6
LetthenumberofmolesofNO2bex
ThemoleofN2O4=100−x
Mavg=nNO2MNO2+nN2O4×MN2O4
76.6=x×46+(100−x)×92100
7660=46x+9200−92x
46x=1540
x=33.48moles
MolesofNO2in100molesofthemixture=33.4
The vapour density of a mixture containing NO2 and N2O4 is 38.3 at 27'C. Calculate moles of NO2 in 100 g of mixture.