1)
2Mg + O2 \(\rightarrow\) 2MgO
4Al + 3O2 \(\rightarrow\)2Al2O3
Ta có: nO2=\(\frac{33,6}{22,4}\)=1,5 mol; nAl=\(\frac{2,7}{27}\)=0,1 mol
Ta có: nO2=\(\frac{1}{2}\)nMg +\(\frac{3}{4}\)nAl\(\rightarrow\) nMg=2,85 mol
\(\rightarrow\) mMg=68,4 gam
\(\rightarrow\) %Al=\(\frac{2,7}{\text{2,7+68,4}}\)=3,8%\(\rightarrow\) %Mg=96,2%