20 g hemoglobin in a 1 L aqueous solution ( A ) at 300 K is separated from pure water by semi permeable membrane. At equilibrium the height of…

$\displaystyle 20$ g hemoglobin in a $\displaystyle 1$ L aqueous solution ( A ) at $\displaystyle 300$ K is separated from pure water by semi permeable membrane. At equilibrium the height of solution in a tube dipped in a solution (A) is found to be $\displaystyle 80.0$ mm higher than the tube dipped in water. The molar mass of hemoglobin is $\displaystyle \_\_\_\_$ $\displaystyle \mathrm{kg} \mathrm{mol}^{-1}$. (Nearest integer) (Given : $\displaystyle \mathrm{g}=10 \mathrm{~m} \mathrm{~s}^{-2}, \mathrm{R}=8.3 \mathrm{kPa} \mathrm{dm}^3 \mathrm{~K}^{-1} \mathrm{~mol}^{-1}$, density of solution $\displaystyle =1000 \mathrm{~kg} \mathrm{~m}^{-3}$ )