PTHH: \(3Fe+2O_2\xrightarrow[]{t^o}Fe_3O_4\)
Ta có: \(n_{Fe}=\dfrac{0,84}{56}=0,015\left(mol\right)\) \(\Rightarrow n_{Fe_3O_4}=0,005\left(mol\right)\)
\(\Rightarrow m_{Fe_3O_4}=0,005\cdot232=1,16\left(g\right)\)
\(n_{Fe}=\dfrac{0.84}{56}=0.015\left(mol\right)\)
\(3Fe+2O_2\underrightarrow{^{^{t^0}}}Fe_3O_4\)
\(0.015.............0.005\)
\(m_{Fe_3O_4}=0.005\cdot232=1.16\left(g\right)\)