Question

An aqueous solution contains 8.7% NaCl by mass.

1. Calculate the molality of the solution.
2. Calculate the mole fraction of the solution.

Answer 1

assume 100 grams of the solution.
you have 8.7 g of NaCl, figure the moles
You have 91.3 g of water, figure the moles

calculate the mole fraction.

molality=molesNaCl/kgsolvent

and you have .1 kg solvent.

Answer 2

1.49 m