TH1:
\(Fe+2HCl\rightarrow FeCl_2+H_2\\ Fe_2O_3+6HCl\rightarrow2FeCl_3+3H_2O\)
\(m_{Cu}=m_{rắn}=6,4\left(g\right)\\ \Rightarrow m_{\left(Fe,Fe_2O_3\right)}=28-6,4=21,6\left(g\right)\\ n_{FeCl_2}=n_{Fe}=n_{H_2}=0,15\left(mol\right)\\ \Rightarrow n_{Fe_2O_3}=\dfrac{21,6-0,15.56}{160}=0,0825\left(mol\right)\\ \Rightarrow n_{FeCl_3}=2.0,0825=0,165\left(mol\right)\\ \Rightarrow m_{muối}=m_{FeCl_2}+m_{FeCl_3}=127.0,15+162,5.0,165=45,8625\left(g\right)\)
TH2: Nếu cho 28 gam hỗn hợp đó tác dụng clo thì như nào nhở???