Răspuns:
m,calcozina impura= 3000kg.......are puritatea 90%
p= m,purx100/m,impur----> m,pur=3000x90/100kg=2700kg
M,CuS2=(64gCu +2x32gS)/mol=160g/mol=160kg/kmol
160kg calcozina pura..........64kgCu
2700kg.........................................x=m,Cu=1080kg
Explicație: