When 23.0g of urea (CH4N2O) are dissolved in 700.g of a certain mystery liquid X, the freezing point of the solution is 6.70 o C less than the freezing point of pure X5. Calculate the mass of ammonium chloride (NH4Cl) that must be dissolved in the same mass of X to produce the same depression in freeting point. The van't. Holf factor i 1.60 for ammonium chloride in X. Be sure your answer has a unit symbol, if necessary, and round your answer to 3 significant digits