PTHH: 2Al + 6HCl \(\rightarrow\) 2AlCl3 + 3H2\(\uparrow\)(1)
Al2O3 + 6HCl \(\rightarrow\) 2AlCl3 + 3H2O(2)
n\(H_2\) = \(\frac{3,36}{22,4}=0,15\left(mol\right)\)
\(TheoPT\left(1\right):n_{Al}=\frac{2}{3}n_{H_2}=\frac{2}{3}.0,15=0,1\left(mol\right)\)
=> mAl = 0,1.27 = 2,7 (g)
=> m\(Al_2O_3\) = 23,1 - 2,7 = 20,4 (g)
=> n\(Al_2O_3\) = \(\frac{20,4}{102}=0,2\left(mol\right)\)
Theo PT(1): nHCl = 3nAl = 3.0,1 = 0,3 (mol)
Theo PT(2): nHCl = 6n\(Al_2O_3\) = 6.0,2 = 1,2 (mol)
=> nHCl = 0,3 + 1,2 = 1,5 (mol)
Đổi : 500ml = 0,5l
=> CM HCl = \(\frac{1,5}{0,5}=3\left(M\right)\)
nH2= 3.36/22.4=0.15 mol
2Al + 6HCl --> 2AlCl3 + 3H2
0.1____0.3____________0.15
mAl= 0.1*2.7=2.7g
mAl2O3= 23.1-2.7=20.4g
nAl2O3= 20.4/102=0.2 mol
Al2O3 + 6HCl --> 2AlCl3 + 3H2O
0.2______1.2
nHCl= 0.3+1.2=1.5 mol
CM HCl= 1.5/0.5=3M