nr. de moli SO2-------> 5 moli SO2
nr. de moli SO3 -------> 5moli SO3
se foloseste rel. n= m: M in care n=nr. de moli ; m=masa subst. ( g )
M=masa molara ( g/moli )
n=m: M
m= n . M
m=5moli . 64 g/moli=320 g SO2
m =5moli . 80g/moli=400 g SO3
MSO2=32 + 2.16=64 -----> 1mol=64g
MSO3= 32 + 3.16=80 ------> 1mol=80g
