a researcher prepares a new compound and uses freezing point depression measurements to determine the molar mass of the compound. he dissolves 1.66 g compound in 75.00 g of cyclohexane. cyclohexane has a freezing point of 6.50 °c and a freezing point depression constant of 20.2°c kg/mol. the freezing point of the solution is measured as 2.98°c. calculate the molar mass of the new compound. record your answer to 3 sig figs