\(n_{H_2}=\dfrac{m}{M}=\dfrac{12}{2}=6\left(mol\right)\)
\(n_{Fe_2O_3}=\dfrac{m}{M}=\dfrac{480}{160}=3\left(mol\right)\)
\(Fe_2O_3+3H_2\rightarrow2Fe+3H_2O\)
1.................3............2............3(mol)
2.................6............4..............(mol)
Lập tỉ lệ: \(\dfrac{6}{3}< \dfrac{3}{1}\Rightarrow H_2\) hết, \(Fe_2O_3\) dư
\(m_{Fe_2O_3\left(du\right)}=n_{Fe_2O_3\left(du\right)}.M=\left(3-2\right).160=160\left(g\right)\)
\(m_{Fe\left(lithuyet\right)}=n.M=4.56=224\left(g\right)\)
\(m_{Fe\left(thucte\right)}=\dfrac{H\%.m_{Fe\left(lithuyet\right)}}{100}=\dfrac{90.224}{100}=201,6\left(g\right)\)