\(n_{Al}=\dfrac{5,4}{27}=0,2\left(mol\right)\\ n_{H_2SO_4}=0,16.5=0,8\left(mol\right)\)
PTHH: 2Al + 3H2SO4 ---> Al2(SO4)3 + 3H2
LTL: \(\dfrac{0,2}{2}< \dfrac{0,8}{3}\rightarrow\)H2SO4 dư
Theo pt: \(\left\{{}\begin{matrix}n_{H_2SO_4\left(pư\right)}=n_{H_2}=\dfrac{3}{2}n_{Al}=\dfrac{3}{2}.0,2=0,3\left(mol\right)\\n_{Al_2\left(SO_4\right)_3}=\dfrac{1}{2}n_{Al}=\dfrac{1}{2}.0,2=0,1\left(mol\right)\end{matrix}\right.\)
\(\rightarrow\left\{{}\begin{matrix}m_{Al_2\left(SO_4\right)_3}=0,1.342=34,2\left(g\right)\\V_{H_2}=0,3.22,4=6,72\left(l\right)\end{matrix}\right.\\ \rightarrow\left\{{}\begin{matrix}C_{M\left(Al_2\left(SO_4\right)_3\right)}=\dfrac{0,2}{5}=0,04M\\C_{M\left(H_2SO_4.dư\right)}=\dfrac{0,8-0,3}{5}=0,1M\end{matrix}\right.\)