PTHH: 2Al2O3 --đp--> 4Al + 3O2
nAl2O3 = \(\dfrac{m}{M}=\dfrac{45}{2.27+3.16}\text{≈ }0,44mol\)
nAl(tt) = \(\dfrac{m}{M}=\dfrac{3,6}{27}\text{≈ }0,13mol\)
So sánh hai số mol:
\(\dfrac{nAl_2O_3\left(pt\right)}{nAl_2O_3\left(tt\right)}:\dfrac{nAl\left(pt\right)}{nAl\left(tt\right)}=\dfrac{2}{0,44}:\dfrac{4}{0,13}\) ≈ 4,55 : 30,77 => Al dư, tính theo Al2O3
nAl(lt) = \(\dfrac{0,44.4}{2}=0,88mol\)
Hiệu suất phản ứng:
H% = \(\dfrac{nAl\left(tt\right)}{nAl\left(lt\right)}.100=\dfrac{0,13}{0,88}.100\text{≈ }14,77\%\)