Chemistry Question.. really need help!!?

A chemist prepares a solution from 1.50g of an unknown, nonelectrolyte compound and 75.0g of cyclohexane as solvent. The freezing point of the solution is 3.80�C below the freezing point of pure cyclohexane. If the value of Kf for cyclohexane is 20.2�C m��, what is the molecular m of the compound?