The molality of a H₂SO₄ solution is 9. The weight of the solute in 1 kg H₂SO₄ solution is:

$9\text{ molal }{\mathrm{H}}_2{\mathrm{SO}}_4=9\times 98{\mathrm{gH}}_2{\mathrm{SO}}_4\text{ in }1000{\mathrm{gH}}_2\mathrm{O}$

$=882{\mathrm{gH}}_2{\mathrm{SO}}_4\text{ in }1882{\mathrm{gH}}_2{\mathrm{SO}}_4\text{ solution }$

$=\frac{882}{1882}\times 1000{\mathrm{gH}}_2{\mathrm{SO}}_4\text{ in }1\mathrm{kg}\text{ solution }$

= 469 g