The molality of 90 %H2SO4 solution is [density =1.8 g ml ]:

Question

The molality of 90 %H2SO4 solution is [density =1.8 g ml ]: (A)  1.8  (B)  48.4  (C)  91.8  (D)  94.6

Tardigrade Admin · Accepted Answer

The density of solution =1.8 g ml Weight of one litre of solution =1800 g ∴ weight of H 2 SO 4 in the solution =(1800 × 90/100) =1620 g ∴ weight of solvent =1800-1620 =180 gm ∴ molality =(1620/98) × (100/180) =91.8

Q. The molality of $90% H_{2} S O_{4}$ solution is [density $= 1.8 g m l$ ]:

$1.8$

$48.4$

$91.8$

$94.6$

The density of solution $= 1.8 g m l$
Weight of one litre of solution $= 1800 g$
$∴$ weight of $H_{2} S O_{4}$ in the solution
$= \frac{1800 \times 90}{100}$
$= 1620 g$
$∴$ weight of solvent $= 1800 - 1620$
$= 180 g m$
$∴$ molality $= \frac{1620}{98} \times \frac{100}{180}$
$= 91.8$

Q. The molality of 90%H2​SO4​ solution is [density =1.8gml ]:

1.8

48.4

91.8

94.6