\(n_{H_2SO_4}=0.6\left(mol\right)\)
\(4Fe^{\dfrac{+3}{4}}\rightarrow4Fe^{3+}+9e\)
\(x...................\dfrac{9}{4}x\)
\(S^{+6}+2e\rightarrow S^{+4}\)
\(0.6......1.2\)
Bảo toàn e :
\(\dfrac{9}{4}x=1.2\Rightarrow x=\dfrac{8}{15}\)
\(m=\dfrac{8}{15}\cdot232=123.7\left(g\right)\)