a) \(n_{O_2}=\frac{V_{O_2}}{22,4}=\frac{2,24}{22,4}=0,1\left(mol\right)\)
\(3Fe+2O_2\underrightarrow{t^o}Fe_3O_4\)
\(0,15\) \(0,1\) \(0,05\left(mol\right)\)
\(m_{Fe_3O_4}=n_{Fe_3O_4}.M_{Fe_3O_4}=0,05.232=11,6\left(g\right)\)
b) \(n_{O_2}=0,1\left(mol\right)\)
\(2KClO_3\underrightarrow{t^o}2KCl+3O_2\)
\(\frac{1}{15}\) \(\frac{1}{15}\) \(0,1\left(mol\right)\)
\(n_{KClO_3}=m_{KClO_3}.M_{KClO_3}=\frac{1}{15}.122,5=\frac{49}{6}=8,16\left(g\right)\)