Дано
m(FeS2) = 300000 kg
W(FeS2)= 40%
m(практ H2SO4) = 800000 kg
-----------------------------------
η(H2SO4)-?
m(FeS2) = 300000 * 40% / 100% = 120 000 кг
120000 X
2FeS2+5O2-->2FeO+4SO2 M(FeS2) = 120 kg/kmol , M(SO2) = 64 kg/kmol
2*120 4*64
X = 120 000*4*64 / 240 = 128000 kg
128000 X
2SO2+O2--->2SO3 M(SO3) = 80 kg/kmol
2*64 2*80
X = 128 000 * 2* 80 / 128 = 160000 kg
160000 X
SO3+H2O-->H2SO4 M(H2SO4) = 98 kg/kmol
80 98
X = 160000*98 / 80 = 196 000kg = 196 t
ответ 196 т