When 18.5 g of glycine (C, H, NO,) are dissolved in 550 g of a certain mystery liquid X, the freezing point of the solution is 2.1 "C lower than the freezing pure X. On the other hand, when 18.5 g of iron nitrate (Fe(NO,),) are dissolved in the same mass of X, the freezing point of the solutions point of pure X. On the other hand, when 18.5 g of iron(III) nitrate 2.2 "C lower than the freezing point of pure X Calculate the Vant Hoff's factor for iron(II) nitrate in X. Be sure your answer has a unit symbol, if necessary, and is rounded to the correct number of significant digits.