a)2 FeS2+7O2---->2Fe2O3+4SO2
2SO2+O2--->2SO3
SO3+H2O----->H2SO4
b) m\(_{FeS2}=\frac{1,2.90}{100}=1,08\left(tấn\right)\)
2FeS2+7O2----->2Fe2O3+4SO2
120 tấn-------------------------128
1,08--------------------------------x tấn
2SO2+O2--->2SO3
128 tấn----------160 tấn
x---------------------y
SO3+H2O--->H2SO4
160 tấn----------196 tấn
y-----------------------z
Vậy x=m\(_{SO2}=\frac{1,08.128}{120}=1.52\left(tấn\right)\)
y=m\(_{SO3}=\frac{1,52.160}{128}=1,9\left(tấn\right)\)
z=m\(_{H2SO4}=\frac{1,9.196}{160}=2,33\left(tấn\right)\)
m\(_{H2SO4}96\%=\frac{2,33.96}{100}=2,23tấn\)
H%=85
=> m\(_{H2SO4}=\frac{2,23.85}{100}=1,9tấn\)