The density of acetic acid vapor at the normal boiling point, 118.5 degrees C, is given by 3.15 g/L (normal boiling point is the boiling temperature at P = 1 atm).

a) calculate the fraction of the vapor that is monomer and the fraction that is dimer.

b) what is the partial pressure of the monomer, P sub m, and of the dimer, P sub d?

c) what is the equilibrium constant, Kp, at this temperature for the reaction:

2 CH3COOH (g) <----> (CH3COOH)2 (g), Kp = (P sub d)/ (P sub m)^2