\(Fe+H_2SO_4\rightarrow FeSO_4+H_2\\ n_{Fe}=\dfrac{28}{56}=0,5\left(mol\right);n_{H_2SO_4}=0,05.2=0,1\left(mol\right)\\ Vì:\dfrac{0,5}{1}>\dfrac{0,1}{1}\Rightarrow Fe.dư\\ n_{Fe\left(p.ứ\right)}=n_{FeSO_4}=n_{H_2}=n_{H_2SO_4}=0,1\left(mol\right)\\ m_{Fe\left(p.ứ\right)}=0,1.56=5,6\left(g\right);m_{H_2}=2.0,1=0,2\left(g\right)\\ m_{FeSO_4}=152.0,1=15,2\left(g\right);m_{H_2SO_4}=98.0,1=9,8\left(g\right)\)