a) Fe2O3 + 3H2SO4 → Fe2(SO4)3 + 3H2O
b) \(n_{Fe_2O_3}=\dfrac{16}{160}=0,1\left(mol\right)\)
Theo PT: \(n_{Fe_2\left(SO_4\right)_3}=n_{Fe_2O_3}=0,1\left(mol\right)\)
\(\Rightarrow m_{Fe_2\left(SO_4\right)_3}=0,1\times400=40\left(g\right)\)
c) Theo PT: \(n_{H_2SO_4}=3n_{Fe_2O_3}=3\times0,1=0,3\left(mol\right)\)
\(\Rightarrow m_{H_2SO_4}=0,3\times98=29,4\left(g\right)\)
\(\Rightarrow C\%_{H_2SO_4}=\dfrac{29,4}{280}\times100\%=10,5\left(M\right)\)