Question

true or False: a) Intermolecular interactions are small for ideal solutions * b) For component B in an ideal solution μB is always less than μB* c) ΔGmix < 0 always for ideal solutions

Answer 1

a) True: There are little or no net intermolecular interactions for ideal solutions, which are not important

b) True: μB < μB*always; since, from Raoult's law,

                μ_B = μ_B* + RT ln x_B,

             Where, x_B is the mole fraction of component B.

             For an ideal mixtures, the component B has 0 < x_B < 1 always,

            so RT lnx_B is negative. Thus, μB < μB*always

c) True: ΔG_mix < 0 always for ideal solutions as the process is always spontaneous.

            now, ΔG_mix = ΔH_mix - TΔS_mix

               ΔH_mix = 0 for ideal solutions and ΔS_mix is > 0 for spontaneos process