\(n_{H_2SO_4}=\dfrac{800.30\%}{98}=\dfrac{120}{49}\left(mol\right)\)
PTHH: Fe + H2SO4 --> FeSO4 + H2
\(\dfrac{120}{49}\)--->\(\dfrac{120}{49}\)--->\(\dfrac{120}{49}\)
=> \(V_{H_2}=\dfrac{120}{49}.22,4=\dfrac{384}{7}\left(l\right)\)
=> \(m_{FeSO_4}=\dfrac{120}{49}.152=\dfrac{18240}{49}\left(g\right)\)