presupun ca 70% este puritatea acidului !
1kmol............3kmol
C6H6 + 3HONO2----> C6H3NO2 + 3H2O
78kg.............3x63kg
104kg.....................m= 252Kg acid pur
p=m,px100/m,i---->70=252x100/m,i-----> m,i=360kg acid impur
masa exces acid: 10x360/100= 36kg
masa totala acid : 360+36=> 396kg