m FeS2 thuc te =250-\(\dfrac{250.4}{100}\)=240g
n FeS2=\(\dfrac{240}{120}\)=2 mol
4FeS+7O2-to>4SO2+2Fe2O3
2-----------3,5----------2------------1 mol
=>VO2=3,5.22,4=78,4l
=>VSO2=2.22,4=44,8l
=>m Fe2O3=1.160=160g
=>Fe2O3:Sắt 3 oxit : oxit bazo
=>SO2: lưu huỳnh dioxit : oxi axit