Calculate the molecular weight of an unknown substance if 0.2064 g of solid was added to 25.00 ml of cyclohexane and the resultant solution exhibited...

Calculate the molecular weight of an unknown substance if 0.2064 g of solid was added to 25.00 ml of cyclohexane and the resultant solution exhibited a freezing point depression of 2.1 degrees celcius.

AnswerFreezing point depression = w/m/W/MWhere w=mass of solutem= molecular weight of soluteW=mass of solventM=molecular weight of solvent= w/m×M/Wm= wM/Tf×W=0.2064×84/2.1×25=0.33