calculate the freezing point of a solution made by dissolving .200g of a molecular compound in 100g of H2O is -0.0120 degrees celsius. Calculate the molecular weight of the compound. The compound does not ionize in water. Kf H2O=1.86 C/m

Answer is: 310 amu
I've tried answering this sooo much! I have given up. Idk how to find amu with this problem given. I know I first have to convert to molality, but after that I cannot figure out how to get amu from that info. I really have tried and I just got back from vacation and missed 2 classes so i was not present for the lecture that covered this section. This is my last resort. Can anyone show the steps to get 310 amu? PLEASE!!!