\(n_{H_2}=\dfrac{6,72}{22,4}=0,3\left(mol\right)\)
PTHH: \(Fe_2O_3+3H_2\xrightarrow[]{t^o}2Fe+3H_2O\)
0,1<-----0,3------>0,2
=> \(\left\{{}\begin{matrix}m_{Fe_2O_3}=0,1.160=16\left(g\right)\\m_{Fe}=21,6-16=5,6\left(g\right)\end{matrix}\right.\)
b) \(\left\{{}\begin{matrix}\%m_{Fe_2O_3}=\dfrac{16}{21,6}.100\%=74,07\%\\\%m_{Fe}=100\%=74,07\%=25,93\%\end{matrix}\right.\)
c) \(m_{Fe\left(sau\right)}=0,2.56+5,6=16,8\left(g\right)\)