Colligative Properties Molar Masses
Elements P and Q form two types of non-volatile, non-ionizable compounds PQ and PQ2. When 1 g of PQ is dissolved in 50 g of solvent ‘A’. ΔTb was 1.176 K while when 1 g of PQ2 is dissolved in 50 g of solvent ‘A’, ΔTb was 0.689 K. (Kb of ‘A’ = 5 K kg mol–1). The molar masses of elements P and Q (in g mol–1) respectively, are :