Question

200g pirita sunt folosite intr-un proces industrial. Calculati cantitatea de pirita pura care va intra in reactie. (impuritati 5%)

Answer 1

200g pirita                               Daca impuritatile sunt 5 la suta atunci puritatea
5 la suta imp.                         este 95 la suta (100-5)
                                                 Se aplica formula puritatii:

                                             p=mp.100:mt
                                             mp=p.mt:100
                                             mp=95.200:100
                                           mp=190 g FeS2   (PIRITA PURA )