a, \(n_{H2}=1,2\left(mol\right)\)
Tạo khí => Al dư
\(2Al+3H_2SO_4\rightarrow Al_2\left(SO_4\right)_3+3H_2\)
0,8________________0,4_______1,2
\(n_{Al\left(bđ\right)}=2\left(mol\right)\Rightarrow n_{Al\left(pư\right)}=1,2\left(mol\right)\)
\(4Al+3O_2\underrightarrow{^{to}}2Al_2O_3\)
1,2___________0,6
\(\Rightarrow m_{Al2O3}=61,2\left(g\right)\)
b,\(Al_2O_3+3H_2SO_4\rightarrow Al_2\left(SO_4\right)_3+3H_2O\)
0,6_____________________0,6______
\(\Rightarrow\Sigma n_{Al2\left(SO4\right)3}=1\left(mol\right)\Rightarrow m=342\left(g\right)\)