Help!!! Reposting this question because last help was wrong... need to know how to do this for upcoming test.

When 10.8g of an organic compound known to be 54.53%C,9.2%H, and 36.32%O by mass is dissolved in 826.5g of water, the freezing point is 0.184C. The normal freezing point of water is 0C. What is the molecular formula for the organic compound? Assume that the organic compound is a molecular solid and does not ionize in water. Kf values for various solvents are given in the colligative constants table