Find the molality of 40 % NaOH (w/w) ?

40 % (w/w) NaOH means 40 g of NaOH is dissolved in 100 g of solution.

Mass of solvent = 100 - 40 = 60 g

Molecular mass of solute (NaOH) = 40 g

No of moles of NaOH = \(\frac{40}{40}\) = 1

Molality, m = \(\frac{1}{60}\) x 1000 = 16.66 m