a) PTHH: \(2Al+3O_2-^{t^o}\rightarrow2Al_2O_3\)
b)Theo PT:2.............3..................2....... (mol)
c)Theo PT: \(n_{O_2}=\frac{3}{2}n_{Al}=\frac{3}{2}.\frac{10,8}{27}=0,6\left(mol\right)\)
\(\Rightarrow m_{O_2}=0,6.32=19,2\left(g\right)\)
\(n_{Al}=\frac{10,8}{27}=0,4\left(mol\right)\)
\(PTHH:4Al+3O_2\rightarrow2Al_2O_3\)
_________4 ______3 ____2_______ (mol)
\(\Rightarrow n_{O2}=\frac{3}{4}n_{Al}=\frac{3}{4}.0,4=0,3\left(mol\right)\)
\(\Rightarrow m_{O2}=0,3.32=9,6\left(g\right)\)