279 kg ms kg
C6H5NH2 + HOSO3H --> H2NC6H4NH2 + H2O
93 98
=> md = 279x98/93 = 294 kg H2SO4
294 kg ..................... 100%
m kg .......................... 100%+10% exces
=> m = 294x110/100 = 323,4 kg
din c% = mdx100/ms
=> ms = mdx100/c%
= 323,4x100/90 = 359,33 kg sol. H2SO4 au fost introsi in reactie