1. (a) One of the limitations of the method of determining the relative molecular mass by freezing point method is that the solute should not associate or dissociate in the solution. (i) State three other limitations of determining the molecular mass by freezing point method (ii) Explain how association of a solute in solution affects the molecular mass determined by freezing point method (b) A solution containing 0.142g of naphthalene in 20.25g of benzene caused a lowering of freezing point of 0.284^circ C Calculate the molecular mass of naphthalene. K_(f) of benzene is 5.12^circ Cmol^-1kg^-1)

(i) Three other limitations of determining the molecular mass by freezing point method are:1. The accuracy of the method is affected by impurities in the solvent.2. The method requires precise temperature measurements, which can be challenging.3. The method is time-consuming compared to other methods of determining molecular mass.(ii) When a solute associates in a solution, it effectively behaves as a larger molecule, leading to a lower observed freezing point depression than expected. This results in an underestimation of the molecular mass of the solute when using the freezing point method.(b) To calculate the molecular mass of naphthalene:Given:Mass of naphthalene, Mass of benzene, Lowering of freezing point, of benzene = The formula for calculating the molecular mass using the freezing point depression is: Where: = Molecular mass of naphthaleneSubstitute the given values into the formula: Solve for : Therefore, the molecular mass of naphthalene is approximately 126.4 g/mol.