Adiffusion coefficient kg was determined for the diffusion of a gas a through a stagnant film b [kg = 0.88 mol//h-ft2-atm].
what is the flux of a from a surface into a mixture of a & b, where b can dissolve into a as a diffuses from the surface?
conditions at the surface pa1 = 0.2 atm @ p = 1 atm
conditions in the bulk pa2 = 0.05 atm & pb2 = 0.95 atm

Explanation:

Transfer of mass A into stagnant film B depends on the availability of driving force.

Whereas driving force is the pressure difference at the surface of A and the bulk.

As,      

Therefore, putting the given values into the above formula as follows.

                     =

                     = 0.132

Thus, we can conclude that the flux of A from a surface into a mixture of A and B is 0.132

b) mutualism

hope this : )