2Al + 3H2SO4 \(\rightarrow\)Al2(SO4)3 + 3H2
nAl=\(\dfrac{5,4}{27}=0,2\left(mol\right)\)
Theo PTHH ta có:
\(\dfrac{1}{2}\)nAl=nAl2(SO4)3=0,1(mol)
nH2=\(\dfrac{3}{2}\)nAl=0,3(mol)
nH2SO4=nH2=0,3(mol)
mH2SO4=98.0,3=29,4(g)
mdd H2SO4=\(29,4:\dfrac{19,6}{100}=150\left(g\right)\)
mAl2(SO4)3=0,1.342=34,2(g)
C% Al2(SO4)3 =\(\dfrac{34,2}{5,4+150-0,3.2}.100\%=22,09\%\)