Question

Calculate (a) molality, (b) molarity and (c) mole fraction of KI if the density of 20% by mass aqueous KI solution is 1.2 g/ml.

Answer 1

Mass % of KI solution → 20%, d = 1.2 g/mL.
(a) Molality, m :
w_A = 100 – 20 = 80 g