When 323. 8 of urea (CH4N2O) are dissolved in 1350. g of a certain mystery liquid X, the freezing point of the solution is 2.90C less than the freezing point of pare X. Calculate the mass of sodium chlonde that must be dissolved in the same mass of X to produce the same depression in freezing point. The van't Hoff factor i=1.62 for sodum chloride in X. Be sure your answer has a unit symbol, If necessary, and is rounded to the correct number of significant digits