m.impura = 700 g , p% = 80%
p% = m.purax100/m.impura
=> m.p = m.ipxp%/100 = 700x80/100
= 560 g Fe pur
560 g md g V L
Fe + H2SO4 => FeSO4 + H2
56 98 22,4
=> md = 560x98/56 = 980 g H2SO4
stim ca c% = mdx100/ms
=> ms = mdx100/c% = 980x100/98
= 1000 g sol H2SO4
=> V = 560x22,4/56 = 224 L H2