19. The equation of continuity of A in a dilute binary solution can be written asHere, is the mass average velocity and is the molar reaction rate of A. For thesituation of pure diffusion in solids, what will the above equation be reduced to?(A) (B)(C)(D)

複選題17. Consider the absorption of gas A by a laminar falling film of liquid B. Gas A is onlyslightly soluble in B, and the diffusion takes place so slowly in the liquid film that Awill not penetrate very far into B. The concentration of A at the interface is maintainedat CAo and the maximum velocity of the fluid is Vmar. Let x be the coordinate into theliquid film, z the coordinate down the liquid film, and DAB the mass diffusivity of A inB. The molar concentration of A, CA, is a function of x and z. Which of the followingstatements is true?(A) CA increases with increasing x.(B) CA decreases with increasing z.(C) CA increases with decreasing at fixed x and z.(D) CA decreases with increasing at fixed x and z.

19. The equation of continuity of A in a dilute binary solution can be written as

Here, is the mass average velocity and is the molar reaction rate of A. For the
situation of pure diffusion in solids, what will the above equation be reduced to?
(A)
(B)
(C)
(D)

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