\(m_{H_2SO_4}=10^6\cdot98\%=980000\left(g\right)\)
\(n_{H_2SO_4}=\dfrac{980000}{98}=10000\left(mol\right)\)
Bảo toàn nguyên số S :
\(2n_{FeS_2}=n_{H_2SO_4}\Rightarrow n_{FeS_2}=\dfrac{10000}{2}=5000\left(mol\right)\)
\(\Rightarrow n_{FeS_2\left(tt\right)}=\dfrac{5000}{80\%}=6250\left(g\right)\)
\(m_{FeS_2}=6250\cdot120=750000\left(g\right)=0.75\left(tấn\right)\)
\(m_{quặng}=\dfrac{0.75}{75\%}=1\left(tấn\right)\)