a.
\(V_{H_2S}=0.75\cdot22.4=16.8\left(l\right)\)
\(V_{SO_2}=\dfrac{12.8}{64}\cdot22.4=4.48\left(l\right)\)
\(V_{O_2}=\dfrac{3.2}{32}\cdot22.4=2.24\left(l\right)\)
b.
\(n_{hh}=\dfrac{22}{44}+\dfrac{3.55}{71}+\dfrac{0.14}{28}=0.555\left(mol\right)\)
\(V_{hh}=0.555\cdot22.4=12.432\left(l\right)\)