Question

and ethanolic solution of naphthalene contains 0.25 mole fraction of solute molality of the solution is

Answer 1

As we all know that molality or moral concentration is nothing but a measure of how much solute is present in the solution and that is done in terms of amount of mass of the solvent. That is we compare the solvent to solute ratio.And we also know that the molar mass of Ethanol is 46.07 gram per mole. The molar mass of naphthalene is 128.17 gram/ moles. Hope the calculation becomes easier now.
The closest answer is option b.

Answer 2

Answer:

here is the answer.. hence the molality of the solution is 7.25m