a/ \(4Al\left(\frac{1}{15}\right)+3O_2\left(0,05\right)\rightarrow2Al_2O_3\left(\frac{1}{30}\right)\)
b/ \(n_{Al}=\frac{1,8}{27}=\frac{1}{15}\)
\(\Rightarrow m_{Al_2O_3}=102.\frac{1}{30}=3,4\)
c/ \(V_{O_2}=0,05.22,4=1,12\)
\(\Rightarrow V_{kk}=1,12.5=5,6\)
d/ \(2KMnO_4\left(0,1\right)\rightarrow K_2MnO_4+MnO_2+O_2\left(0,05\right)\)
\(\Rightarrow m_{KMnO_4}=0,1.158=15,8\)