Twenty grams of hemoglobin in 1L solution at 300K is separated from pure water by a semipermeable.At equilibrium,the height of solution (density $1gcm^{-3}$) in a tube dipped in solution is found to be 83.1mm higher than in the tube dipped in water.If $g=10ms^{-2}$ ,the molar mass of hemoglobin is about

Question

$\begin{array}{1 1}30kgmol^{-1}\\40kgmol^{-1}\\60kgmol^{-1}\\80kgmol^{-1}\end{array} $