Số xấu quá em xem lại đề nha
\(Fe+2HCl\rightarrow FeCl_2+H_2\)
a) \(n_{Fe}=\dfrac{m}{M}=\dfrac{22,4}{56}=0,4\left(mol\right)\)
\(n_{HCl}=\dfrac{m}{M}=\dfrac{18,5}{36,5}=\dfrac{37}{73}\left(mol\right)\)
Lập bảng: \(\dfrac{0,4}{1}>\dfrac{\dfrac{37}{73}}{2}\)
⇒ sau pư HCl hết, Fe dư
⇒ theo \(n_{HCl}\)
Theo PTHH: \(n_{Fe\left(pư\right)}=\dfrac{1}{2}n_{HCl}=\dfrac{\dfrac{37}{73}}{2}=\dfrac{37}{146}\left(mol\right)\)
⇒ \(n_{Fe\left(dư\right)}=0,4-\dfrac{37}{146}=\dfrac{107}{730}\left(mol\right)\)
\(\Rightarrow m_{Fe\left(dư\right)}=n.M=\dfrac{107}{730}.56=\dfrac{2996}{365}\left(g\right)\)
b) Theo PTHH: \(n_{H_2}=\dfrac{1}{2}n_{HCl}=\dfrac{\dfrac{37}{73}}{2}=\dfrac{37}{146}\left(mol\right)\)
\(\Rightarrow V_{H_2\left(đktc\right)}=n.22,4=\dfrac{37}{146}.22,4=\dfrac{2072}{365}\left(l\right)\)
c) Theo PTHH: \(n_{FeCl_2}=n_{H_2}=\dfrac{37}{146}\left(mol\right)\)
\(\Rightarrow m_{FeCl_2}=n.M=\dfrac{37}{146}.127=\dfrac{4699}{146}\left(g\right)\)
