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  4. The molality of a 10 % (v/v) solution of di-bromine solution in CCl 4 (carbon tetrachloride) is ' x '. x= × 10-2 M. (Nearest integer) [Given: molar mass of Br 2=160 g mol -1 atomic mass of C =12 g mol -1 atomic mass of Cl =35.5 g mol -1 density of dibromine =3.2 g cm -3 density of CCl 4=1.6 g cm -3 ]

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Q. The molality of a $10 \%$ (v/v) solution of di-bromine solution in $CCl _4$ (carbon tetrachloride) is ' $x$ '. $x=$____ $\times 10^{-2} M$. (Nearest integer)
[Given : molar mass of $Br _2=160 \,g \,mol ^{-1}$
atomic mass of $C =12\, g \,mol ^{-1}$
atomic mass of $Cl =35.5\, g\, mol ^{-1}$
density of dibromine $=3.2 \,g\, cm ^{-3}$
density of $CCl _4=1.6\, g \,cm ^{-3}$ ]

JEE MainJEE Main 2023Some Basic Concepts of Chemistry

Solution:

( $10\, ml$ solute in $90 \,ml$ solvent
mass of solute $=10 \times 3.2=32 \,g$
mass of solvent $=90 \times 1.6 \,g$
$m =\frac{32 \times 1000}{160 \times 90 \times 1.6}=1.388$
$m-138.8 \times 10^{-2}-139$