What is the van’t Hoff factor for HX in water

HX is a weak acid that partially dissociates in water: HX -> H1 X1-. A 0.515-m aqueous solution of HX has a freezing point of -1.47 oC. Express your answers to the following to three significant figures.a) What is the van’t Hoff factor for HX in water?i =b) What is the molality of X1- ions in the solution?