${\rm{Zn}} + {{\rm{H}}_{\rm{2}}}S{O_4} \to ZnS{O_4} + {H_2}$
$\,\,\,\,\,\,\,\,\,\,\frac{1}{{100}}\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\frac{{224}}{{22400}} = \frac{1}{{100}}$
વજન $ = \frac{{\rm{1}}}{{{\rm{100}}}} \times 65 = 0.65\,g$