a, Al tan dần trong dd H2SO4, có sủi bọt khí không màu mùi
\(n_{Al}=\dfrac{2,7}{27}=0,1\left(mol\right)\)
PTHH: 2Al + 3H2SO4 ---> Al2(SO4)3 + 3H2
0,1---->0,15---------------------->0,15
H2 + CuO --to--> Cu + H2O
0,15-->0,15
=> \(\left\{{}\begin{matrix}V=0,15.22,4=3,36\left(l\right)\\a=0,15.98=14,7\left(g\right)\\m_{CuO}=0,15.80=12\left(g\right)\end{matrix}\right.\)