\(a.\)
\(n_{KClO_3}=\dfrac{9.8}{122.5}=0.08\left(mol\right)\)
\(2KClO_3\underrightarrow{t^0}2KCl+3O_2\)
\(0.08.......................0.12\)
\(V_{O_2}=0.12\cdot22.4=2.688\left(l\right)\)
\(b.\)
\(n_{H_2O}=\dfrac{36\cdot1000}{18}=2000\left(mol\right)\)
\(2H_2O\underrightarrow{đp}2H_2+O_2\)
\(2000.............1000\)
\(V_{O_2}=1000\cdot22.4=22400\left(l\right)\)