a) PTHH: \(4FeS_2+11O_2\underrightarrow{t^o}2Fe_2O_3+8SO_2\)
b) Ta có: \(m_{FeS_2}=3\cdot80\%=2,4\left(tấn\right)\)\(\Rightarrow n_{FeS_2}=\frac{2,4}{120}=0,02\left(mol\right)\)
\(\Rightarrow\left\{{}\begin{matrix}n_{Fe_2O_3}=0,01mol\\n_{SO_2}=0,04mol\end{matrix}\right.\) \(\Rightarrow\left\{{}\begin{matrix}m_{Fe_2O_3}=0,01\cdot160=1,6\left(tấn\right)\\V_{SO_2}=0,4\cdot22,4=0,896\left(l\right)\end{matrix}\right.\)