Explanation:

\[\begin{array}{l}
{\mkern 1mu} {\rm{8KI + }}\mathop {{\rm{5}}{{\rm{H}}_{\rm{2}}}{\rm{S}}{{\rm{O}}_{\rm{4}}}}\limits_{({\rm{5}}\;{\rm{mol}})} \to \mathop {{\rm{4}}\;{{\rm{K}}_{\rm{2}}}{\rm{S}}{{\rm{O}}_{\rm{4}}}}\limits_{} + {\rm{4}}{{\rm{I}}_{\rm{2}}} + \\
\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\mathop {{{\rm{H}}_{\rm{2}}}\;{\rm{S}}}\limits_{({\rm{1mol}})} {\mkern 1mu} {\mkern 1mu} {\rm{ + }}{\mkern 1mu} {\mkern 1mu} {\rm{4}}{{\rm{H}}_{\rm{2}}}{\rm{O}}
\end{array}\]