Question

Equal amounts of solutions of NaOH having
concentration 10% (wt/wt) and 20% (wt/wt) are
mixed. What will be molality of the NaOH in the
resulting solution?
(1) 1.5 m
(2) 4.4 m​

Answer 1

Our solute is NaCl and the solvent is water. molality is the moles of solute per kg of solvent. Moles of NaCl could be calculated on dividing it's grams by it's molar mass(58.44). So, 2%(w/w) NaCl molality is 0.35m.