The freezing point of benzene ,C6H6,is 5.500 degrees at 1atmosphere .Kf( benzene) =5.12 degrees C/m in a laboratory experiment, students synthesized a new compound and found that when 10.48 grams of the compound were dissolved in 262.6 grams of benzene,the solution began to freeze at 4.924 degrees centigrade.The compound was also found to be non volatile and a non electrolyte. what is the molecular weight they determined for this compound?