- Gọi công thức tổng quát: \(Fe_xO_y\)
\(m_{Fe}=\dfrac{\%Fe.M_{hc}}{100}=\dfrac{\left(100-30\right).160}{100}=112\left(g\right)\)
\(m_O=\dfrac{\%O.M_{hc}}{100}=\dfrac{30.160}{100}=48\left(g\right)\)
\(n_{Fe}=\dfrac{m_{Fe}}{M_{Fe}}=\)\(\dfrac{112}{56}=2\left(mol\right)\)
\(n_O=\dfrac{m_O}{M_O}=\dfrac{48}{16}=3\left(mol\right)\)
-> x = 2 ; y = 3
=> \(Fe_2O_3\)