a,
PTHH:
\(2S+3O_2\underrightarrow{t^0}2SO_3\)
b, \(n_S=\frac{16}{32}=0,5\left(mol\right)\)
Theo PTHH:
\(n_{O2}=n_S\cdot\frac{3}{2}=0,5\cdot\frac{3}{2}=0,75\left(mol\right)\)
=> \(V_{O2}=0,75\cdot22,4=16,8\left(l\right)\)
\(V_{kk}=16,8:20\%=84\left(l\right)\)