The density of toluene (C7H8) is 0.876, and the density of thiophene (C4H4S) is 1.065 g/mL. A

Question:

The density of toluene (C7H8) is 0.876, and the density of thiophene (C4H4S) is 1.065 g/mL. A solution is made by dissolving 8.10 g of thiophene in 250.0 mL of toluene.
(a) Calculate the mole fraction of thiophene in the solution.
(b) Calculate the molality of thiophene in the solution.
(c) Assuming that the volumes of the solute and solvent are additive, what is the molarity of thiophene in the solution?