\(n_{H2}=\dfrac{6,72}{22,4}=0,3\left(mol\right)\)
Pt : \(2Al+6HCl\rightarrow2AlCl_3+3H_2|\)
2 6 2 3
0,2 0,2 0,3
\(Al_2O_2+6HCl\rightarrow2AlCl_3+3H_2|\)
1 6 2 3
0,2 0,4
a) \(n_{Al}=\dfrac{0,3.2}{3}=0,2\left(mol\right)\)
\(m_{Al}=0,2.27=5,4\left(g\right)\)
\(m_{Al2O3}=25,8-5,4=20,4\left(g\right)\)
b) Có : \(m_{Al2O3}=20,4\left(g\right)\)
\(n_{Al2O3}=\dfrac{20,4}{102}=0,2\left(mol\right)\)
\(n_{AlCl3\left(tổng\right)}=0,2+0,4=0,6\left(mol\right)\)
⇒ \(m_{AlCl3}=0,6.133,5=80,1\left(g\right)\)
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