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 solution in a tube dipped in a solution ( $A$ ) is found to be 80.0 mm higher than the tube dipped in water. The molar mass of hemoglobin is $\_\_\_\_$ $\mathrm{kgmol}^{-1}$. (Nearest integer) (Given : $\mathrm{g}=10 \mathrm{~m} \mathrm{~s}^{-2}, \mathrm{R}=8.3 \mathrm{kPadm}^3 \mathrm{~K}^{-1} \mathrm{~mol}^{-1}$, density of solution $=1000 \mathrm{~kg} \mathrm{~m}^{-3}$ )