\(n_{H_2}=\dfrac{6.72}{22.4}=0.3\left(mol\right)\)
\(2Al+6HCl\rightarrow2AlCl_3+3H_2\)
\(0.2.....................................0.3\)
\(m_{Cu}=10-0.2\cdot27=4.6\left(g\right)\)
\(n_{Cu}=\dfrac{4.6}{64}=\dfrac{23}{320}\left(mol\right)\)
\(4Al+3O_2\underrightarrow{^{^{t^0}}}2Al_2O_3\)
\(2Cu+O_2\underrightarrow{^{^{t^0}}}2CuO\)
\(V_{O_2}=\left(\dfrac{3}{4}\cdot0.2+\dfrac{23}{320\cdot2}\right)\cdot22.4=4.165\left(l\right)\)