The mole fraction of a solute in a solution is 0.1. At 298 K, molarity of this solution is the sameas its molality. Density of this solution at 298 K is 2.0 gcm$$^{-3}$$. Theratio of the molecular weights of the solute and solvent, $$\left(\frac{MW_{solute}}{MW_{solvent}}\right)$$, is