4 FeS2 + 11 O2 -to-> 2 Fe2O3 + 8 SO2
5.105<----------------------------------106 (mol)
SO2 + 1/2 O2 -to-> SO3
106<--------------------106 (mol)
SO3 + H2O -> H2SO4
106<---------------106 (mol)
mH2SO4= 98% x 100=98(tấn)
=> nH2SO4= (98.106)/98=106 (mol)
n(FeS2,thực tế)= (5.105): 90%= 5000000/9 (mol)
=> mFeS2(thực tế)= 5000000/9 x 120 = (2.108)/3 (g)
=> m(quặng pirit)= (2.108)/3 : 96% \(\approx\) 69 444 444,444 (g) \(\approx\) 69,44444444 (tấn)