When 157. g of alanine C3H7NO2 are dissolved in 1050. g of a certain mystery liquid X, the freezing point of the solution is 4.90°C less than the freezing point of pure X. Calculate the mass of sodium chloride that must be dissolved in the same mass of X to produce the same depression in freezing point. The van't Hoff factor =i1.62 for sodium chloride in X.