2SO2 + O2------> 2SO3
moli,initial a b 0
moli transformati -2x -x +2x
moli, echilibru a-2x =1 b-x =3 2
2x=2---> x= 1mol/l
a= 3mol SO2
b=4mol O2 a/b= 3/4
din ecuatie, reazulta 2molSO3.......1molO2
3mol..................x x= 3/2 molO2
V,O2-= niuxVm= 3/2x22,4 l=33,6 l
V aer=100xV,O2/20 L= 168 L