\(n_{HCl}=0,15mol\)
-Gọi công thức FexOy
FexOy+2yHCl\(\rightarrow\)xFeCl2y/x+yH2O
\(n_{Fe_xO_y}=\dfrac{1}{2y}n_{HCl}=\dfrac{0,15}{2y}mol\)
\(M_{Fe_xO_y}=\dfrac{4}{\dfrac{0,15}{2y}}=\dfrac{160y}{3}\)\(\rightarrow\)56x+16y=\(\dfrac{160y}{3}\)
\(\rightarrow\)168x+48y=160y\(\rightarrow\)168x=112y\(\dfrac{x}{y}=\dfrac{112}{168}=\dfrac{2}{3}\)
Fe2O3