pt:
4Al+3O2--->2Al2O3
a____3/4a____1/2a
3Fe+2O2--->Fe3O4
b___2/3b_____1/3b
Hệ pt:
\(\left\{{}\begin{matrix}27a+56b=13,8\\51a+\dfrac{232}{3}b=21,8\end{matrix}\right.\)
=>\(\left\{{}\begin{matrix}a=0,2\\b=0,15\end{matrix}\right.\)
\(\Sigma\)nO2=3/4a+2/3b=3/4.0,2+0,15.2/3=0,25(mol)
=>VO2=0,25.22,4=5,6(l)