What is the molar mass of a solution of

What is the molar mass of a solution of 5.00g of a compound in 25.00 g of carbon tetrachloride (bp 76.8 degree C; Kb=5.02 degree C/m) that boils at 81.5 degrees C at 1 atm? (Hint: Compounds do NOT dissociate in nonpolar solvent such as CCL4. What is the molarity of the solution?).I need to see the work as well so I can see and learn how the problem was done. Thanks