The experimental values of the partial molar volume of a salt in water are found to fit the expression vB = 5.117 + 19.121x1/2, where vB = VB/(cm3 mol1 ) and x is the numerical value of the molality of B (x = b/b ). Use the GibbsDuhem equation to derive an equation for the molar volume of water in the solution. The molar volume of pure water at the same temperature is 18.079 cm3