or $C_{1}=C_{2}(\text { conc. in mol/lit.})$
(urea solution) (unknown solution)
$\frac{10}{60}=\frac{5 \times 1000}{m w \times 100}$
$m_{W}=300 \;g m\; m o l^{-1}$
(આપેલ : $R =0.083\,L\,bar\,K ^{-1}\,mol ^{-1}$ )
[આપેલ $K_b (H_2O) = 0.52\, K\, kg\, mol^{-1}]$