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