a, \(n_{Fe}=\dfrac{8,4}{56}=0,15\left(mol\right)\)
\(n_{HCl}=\dfrac{14,6}{36,5}=0,4\left(mol\right)\)
PT: \(Fe+2HCl\rightarrow FeCl_2+H_2\)
Xét tỉ lệ: \(\dfrac{0,15}{1}< \dfrac{0,4}{2}\), ta được HCl dư.
Theo PT: \(n_{HCl\left(pư\right)}=2n_{Fe}=0,3\left(mol\right)\Rightarrow n_{HCl\left(dư\right)}=0,4-0,3=0,1\left(mol\right)\)
\(\Rightarrow m_{HCl\left(dư\right)}=0,1.36,5=3,65\left(g\right)\)
b, \(n_{H_2}=n_{Fe}=0,15\left(mol\right)\Rightarrow V_{H_2}=0,15.22,4=3,36\left(l\right)\)
c, \(FeO+H_2\underrightarrow{t^o}Fe+H_2O\)
_________0,15__0,15 (mol)
⇒ mFe = 0,15.56 = 8,4 (g)