1. A gas A diffuses through a nondiffusing B across a stagnant film of thickness 2 mm at ambient conditions. Given: mole fractions of A on the two sides of the film are yai=0.3, YA2=0.03; molar flux, NA = 5 x 10-4kmol/m2.s. Calculate mass transfer coefficient. Also calculate the molar flux if the transport of A occurs through a stagnant film of B, 1 mm thick, for you = 0.2 and yA2 = 0.03. (2) 2. A student measured the liquid-phase mass transfer coefficient for absorption of A in water. Applying the film theory he calculated the thickness of the liquid film. 8 = 0.02 mm. If the diffusivity of A in water is 1.1 x 10-5cm /s, what would have been the value of the surface renewal rate (per second) if he had applied the surface renewal theory to his study