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(a) Air (B) 2 22-2 1 Liquid Benzene (A) Figure 1 Diffusion of benzene through stagnant, nondiffusing air Benzene vapor (A) diffuses through the air (B) in the tube as shown in Fig. 1. The boundary at the liquid surface at point 1 is impermeable to air due to insoluble of air in benzene liquid. From the general equation of diffusion of gases A and B plus convection, derive and prove that the rate of evaporation of benzene is given as follows; N DABP (PA-PA2) RT(22 - 2)PBM (10 Marks)