a) \(2Al+3H_2SO_4\rightarrow Al_2\left(SO_4\right)_3+3H_2\)
\(n_{Al}=\dfrac{5,4}{54}=0,1\left(mol\right)\)
Theo PTHH: \(n_{Al_2\left(SO_4\right)_3}=\dfrac{1}{2}n_{Al}=0,05\left(mol\right)\)
\(\Rightarrow m_{Al_2\left(SO_4\right)_3}=0,05\cdot342=17,1\left(g\right)\)
Hiệu suất phản ứng là:
\(H=\dfrac{17,1}{18}\cdot100\%=95\%\)
b) Theo PTHH: \(n_{H_2}=\dfrac{0,1\cdot3}{2}=0,15\left(mol\right)\)
\(\Rightarrow V_{H_2,dkc}=0,15\cdot24,79=3,7185\left(l\right)\)