Science Homework Help

The freezing point of benzene C6H6 is 5.5000C at 1 atmosphere. formula and how to do it please

In a laboratory experiment, students synthesized a new compound and found that when 12.70 grams of the compound were dissolved in 274.0 grams of benzene, the solution began to freeze at 4.4550C. The compound was also found to be nonvolatile and a non-electrolyte.
Kb (0C / m) = -5.12

What is the molecular weight they determined for this compound ?_______17.05_________g/mol