\(n_{Al}=\dfrac{5,4}{27}=0,2\left(mol\right)\)
a)
PTHH:
\(2Al+3H_2SO_4\rightarrow Al_2\left(SO_4\right)_3+3H_2\)
0,2-->0,3------------------------->0,3
b) \(V_B=V_{H_2}=0,3.22,4=6,72\left(l\right)\)
c) \(C\%_{H_2SO_4}=\dfrac{0,3.98.100\%}{200}=14,7\%\)