When 252. g of alanine (C3H7NO2) are dissolved in 1400.g of a certain mystery liquid X, the freezing point of the solution is 8.10C less than the freezing point of pure X. Calculate the mass of ammonium chloride (NH4Cl) that must be dissolved in the same mass of X to produce the same depression in freezing point. The van't Hoff factor i=1.90 for ammonium chloride in X. Be sure your answer has a unit symbol, if necessary, and is rounded to the correct number of significant digits