please help and show how to solve!! :)

Quinine is a natural product extracted from the bark of the cinchona tree, which is native to South America. Quinine is used as an antimalarial agent. When 1.85g of quinine is dissolved in 25.0g of cyclohexane, the freezing point of the solution is lowered by 4.74C. Look up the freezing point and Kf constant for cyclohexane in the Colligative Constants table, Calculate the molar mass of quinine