a, Ta có:
\(\left\{{}\begin{matrix}n_{Al}=0,2\left(mol\right)\\n_S=0,15\left(mol\right)\end{matrix}\right.\)
\(2Al+3S\rightarrow Al_2S_3\)
Giả sử H = 100%
Dư 0,1 mol Al . Tạo 0,05 mol Al2S3
\(\Rightarrow m_{Al2S3}=7,5\left(g\right)\)
\(\Rightarrow H=\frac{6.100}{7,5}=80\%\)
b, \(H=80\%\Rightarrow\) Sau phản ứng \(0,15.80\%=0,12\left(mol\right)\)
\(n_{Al\left(pư\right)}=0,08\left(mol\right)\)
\(n_{Al2S3}=0,04\left(mol\right)\)
\(\Rightarrow X\) gồm \(\left\{{}\begin{matrix}0,12\left(mol\right)Al\\0,03\left(mol\right)S\\0,04\left(mol\right)Al_2S_3\end{matrix}\right.\)
\(2Al+6HCl\rightarrow2AlCl_3+3H_2\)
0,12__________________0,18
\(Al_2S_3+6HCl\rightarrow2AlCl_3+3H_2S\)
0,04______________________0,12
\(\Rightarrow V_{khi}=22,4.\left(0,18+0,12\right)=6,72\left(l\right)\)