\(n_{H2}=0,15\left(mol\right)\)
\(n_{Al\left(SO4\right)3}=0,235\left(mol\right)\rightarrow\Sigma n_{H2SO4}=2n_{Al\left(SO4\right)3}=0,705\left(mol\right)\)
\(H_2SO_4\rightarrow H_2\)
0,15_____0,15
\(H_2SO_4\rightarrow H_2O\)
0,555____0,555
Áp dụng ĐL bảo toàn KL:
\(m=m_{Al2\left(SO4\right)3}+m_{H2}+m_{H2O}-m_{H2SO4}\)
\(=21,57\left(g\right)\)