試題詳解

15. Consider a spherical particle A of radius R dissolving in a stagnant liquid B. Once dissolved, A and B react to form C with an irreversible first-order reaction reaction rate constant k). The solubility of A in B, CAo, is small and the system can be approximated as a dilute binary system. The diffusivity of A in B is DAB. The system can be treated as in a pseudo-steady state. Let b2 denote (k,R/DAB). What is the molar flux of A at the particle surface?
(A)
(B)
(C)
(D)