4Al+3O2\(\rightarrow\)2Al2O3(1)
X(Al dư, Al2O3)
2Al+6HCl\(\rightarrow\)2AlCl3+3H2(2)
\(n_{Al\left(dư\right)}=\dfrac{2}{3}n_{H_2}=\dfrac{2}{3}.\dfrac{3,36}{22,4}=0,1mol\)
\(n_{HCl}=3n_{Al\left(dư\right)}=0,3mol\)\(\rightarrow\)mHCl=0,3.36,5=10,95 gam
\(\rightarrow m_{Al\left(dư\right)}=0,1.27=2,7g\)
\(\rightarrow\)\(m_{Al_2O_3}=12,9-2,7=10,2gam\)\(\rightarrow\)\(n_{Al_2O_3}=\dfrac{m}{M}=\dfrac{10,2}{102}=0,1mol\)
-Theo PTHH(1): \(n_{Al\left(pu\right)}=2n_{Al_2O_3}=2.0,1=0,2mol\)
\(\rightarrow\)\(n_{Al\left(bđ\right)}=0,2+0,1=0,3mol\)
m=mAl=0,3.27=8,1 gam
\(n_{O_2}=\dfrac{3}{2}n_{Al_2O_3}=\dfrac{3}{2}.0,2=0,3mol\)
\(\rightarrow\)\(m_{O_2}=0,3.32=9,6gam\)