PTHH:
\(4FeS_2\left(\dfrac{23.10^6}{49}\right)+11O_2\rightarrow2Fe_2O_3+8SO_2\left(\dfrac{46.10^6}{49}\right)\)
\(2SO_2\left(\dfrac{46.10^6}{49}\right)+O_2\rightarrow2SO_3\left(\dfrac{46.10^6}{49}\right)\)
\(SO_3\left(\dfrac{46.10^6}{49}\right)+H_2O\rightarrow H_2SO_4\left(\dfrac{46.10^6}{49}\right)\)
\(n_{H_2SO_4}=\dfrac{92.10^6}{98}=\dfrac{46.10^6}{49}\left(mol\right)\)
\(\Rightarrow m_{FeS_2\left(pứ\right)}=\dfrac{23.10^9}{49}.120=\dfrac{2760.10^6}{49}\left(g\right)\)
\(\Rightarrow m_{FeS_2\left(dung\right)}=\dfrac{\dfrac{2760.10^6}{49}}{80\%}=\dfrac{3450.10^6}{49}\left(g\right)=\dfrac{3450}{49}\left(tan\right)\)