A particular solvent freezes at 2. 57°C. A solution that has 3. 43 g of compound X in 35. 0 g of this solvent freezes at 5. 86°C. If kf for the solvent is -5. 12 C/m, the molecular mass (g/mol) of X is __. (Provide answer to 2 decimal places. Assume the compound x is nonelectrolyte. )