Final answer:
To determine the molality of a LiCl solution with a mole fraction of 0.0900, additional information such as the total mass or the masses of solvent and solute is required, since molality is calculated based on the moles of solute per kilograms of solvent.
Step-by-step explanation:
To calculate the molality of a solution with a mole fraction (XLiCl) of 0.0900 for LiCl, more information like the total mass of the solution or the masses of solvent and solute is needed. Molality is defined as the moles of solute per kilograms of solvent, not the mole fraction. Since the question does not provide that information, the molality cannot be determined directly from the mole fraction alone. It's important to distinguish between different measures of concentration such as molality, molarity, and mole fraction, which are calculated differently.
Molality (m) is the concentration of a solution usually expressed in terms of the number of moles of solute divided by the kilogram of solvent, not the entire solution. Therefore, knowing just the mole fraction is insufficient to calculate molality without the mass of solvent or the total solution mass.