\(\begin{array}{l}
{n_{Fe}} = 8,4/56 = 0,15\,(mol)\\
Fe\,\,\, + \,\,\,\,{H_2}S{O_4}\,\,\,\, \to \,\,\,\,FeS{O_4}\,\,\,\,\, + \,\,\,\,{H_2}\\
0,15\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,0,15\,\,\,\,\,\,\,\,\,\,\,\,0,15\,\,(mol)\\
\Rightarrow \,{V_{{H_2}}} = 0,15.22,4 = 3,36(l)\\
\Rightarrow {m_{FeS{O_4}}} = 0,15.152 = 22,8(g)
\end{array}\)
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