`Fe + 2HCl -> FeCl_2 + H_2 \uparrow`
`0,1` `0,1`
`n_[Fe(bđ)]=[11,2]/56=0,2(mol)`
`n_[H_2]=[2,24]/[22,4]=0,1(mol)`
`=>H=[0,1]/[0,2].100=50%`
\(n_{Fe}\text{ (ban đầu)}=\dfrac{11,2}{56}=0,2\left(mol\right)\)
\(n_{H_2}=\dfrac{2,24}{22,4}=0,1\left(mol\right)\)
\(Fe+2HCl\rightarrow FeCl_2+H_2\uparrow\)
0,1 ← 0,1
\(\Rightarrow n_{Fe}\text{ (phản ứng)}=0,1\left(mol\right)\)
Hiệu suất \(H=\dfrac{n_{Fe}\text{ (phản ứng)}}{n_{Fe}\text{ (ban đầu)}}\cdot100\%=\dfrac{0,1}{0,2}\cdot100\%=50\%\).