# The freezing point of a solution of acetic acid (mole fraction is 0.02) in benzene is 277.4 K. Acetic acid exists partly as a dimer 2A .Determine the equilibrium constant for dimerisation. Freezing point of benzene is 278.4 K and $K_f$ for benzene is 5.

3.19 kg $mol^{−1}$