The mole fraction of an aqueous solution of lithium fluoride is 0.42. Calculate the molarity (in mol/L) of the lithium fluoride solution, if the density of the solution is 1.49 g mL^-1. Determine the mole fraction of zinc(II) bromide in a 5.26 M aqueous solution of zinc(II) bromide. The density of the solution is 1.47 g mL^-1.