Calculez masa de fier pur ,stiind ca puritatea este p=(100-8)%
p/100= m,pur/m,impur
92/100= m,pur/400----> m,pur=368g Fe pur
2x56g......3x71g
ecuatia reactiei: 2Fe + 3Cl2---> 2FeCl3 A,Fe=56 A,Cl=35,5
368g............x
x= 368x3x71/2x56......................calculeaza