An aqueous solution is 40.0% by mass hydrochloric acid, HCl, and has a density of 1.20 g/mL.

Question

The molality of hydrochloric acid in the solution is m.

Answer 1

40% w/w HCl means 40g HCl in 100 g solution.
That is 40g HCl in (40g HCl + 60g H2O).
mols HCl in 40 g = 40/about 36.5 = about 1.1 but you need a more accurate number.
Then m = mols/kg solvent = 1.1mol/0.060kg solvent = ?m.
I think you need density to determine the molarity but not the molality.

Answer 2

An aqueous solution is 40.0 % by mass hydrochloric acid, HCl, and has a density of 1.20 g/mL.

The mole fraction of hydrochloric acid in the solution is