\(n_{Fe}=\dfrac{m}{M}=\dfrac{22,4}{56}=0,4\left(mol\right)\\ n_{H_2SO_4}=\dfrac{m}{M}=\dfrac{49}{98}=0,5\left(mol\right)\\ PTHH:Fe+H_2SO_4->FeSO_4+H_2\)
tỉ lệ 1 : 1 : 1 : 1
n(mol) 0,4------->0,4-------->0,4-------->0,4
\(\dfrac{n_{Fe}}{1}< \dfrac{n_{H_2SO_4}}{1}\left(\dfrac{0,4}{1}< \dfrac{0,5}{1}\right)\)
`=>Fe` hết, `H_2 SO_4` dư, tính theo `Fe`
\(n_{H_2SO_4\left(dư\right)}=0,5-0,4=0,1\left(mol\right)\\ m_{H_2SO_4\left(dư\right)}=n\cdot M=0,1\cdot98=9,8\left(g\right)\\ V_{H_2\left(dktc\right)}=n\cdot22,4=0,4\cdot22,4=8,96\left(l\right)\)