試題詳解

22. Commercial grade hydrofluoric acid (HF = 20.01 g mol^-1) solutions are typically 48.0% (w/w). What is the molality of the HF, if the solution has a density of 1.15 g mL^-1?
(A) 20.9 m
(B) 27.6 m
(C) 40.1 m
(D) 46.1 m
(E) 53.1 m