Henry’s law is often a convenient reference state for the dilute components in the liquid phase in equilibria calculations.

(a) Consider a solution of acetone (1) in water (2) vs. a solution of methane (1) in water (2). Which solution has the larger Henry’s law constant, Hi? Explain.

(b) Consider a binary mixture of

(a) and (b), in which the Henry’s law constant for species a, Ha, at a certain temperature, is equal to its pure species fugacity, fa. Plot the activity coeffi cient, ga, as a function of mole fraction xa.