The freezing point of the solution i

A solution contains 11.45g of unknown compound dissolved in 50.0 mL of water. (Assume a density of 1.00 g/mL for water.) The freezing point of the solution is -4.73 degree celsius. The mass percent composition of the compound is 53.31% C 11.19% H and the rest is O.What is the molecular formula of the compound?