3Fe+2O2-to>Fe3O4
0,75---0,5--------0,25
n O2=0,5 mol
=>m Fe=0,75.56=42g
=>m Fe3O4=0,25.232=58g
\(n_{O_2}=\dfrac{11,2}{22,4}=0,5mol\)
\(3Fe+2O_2\rightarrow\left(t^o\right)Fe_3O_4\)
0,75 0,5 0,25 ( mol )
\(m_{Fe}=0,75.56=42g\)
\(m_{Fe_3O_4}=0,25.232=58g\)