Revisit the example of diffusion and instantaneous reaction of Section 6.5.2. There we determined the flux of species \(a\) through the original vapor-liquid interface at \(y=0\). However, we would really like to know the flux at the interface defined by the reaction front \(y^{\prime}\). Using the solution and the values for the parameters given in the section, determine the flux of \(a\) at \(y^{\prime}\). Does the flux of \(b\) equal that of \(a\) at \(y^{\prime}\) ?

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6.5.2 TRANSIENT ABSORPTION WITH INSTANTANEOUS REACTION [9] In Chapter 5 we saw that having a chemical reaction on the boundary could increase the flux of mate- rial through that surface. We would now like to consider that process in a transient setting. Suppose Nao (mol/m) 3000 Bulk motion included -- Dilute solutions 2500 2000 1500 1000 500 0 0 0.2 0.4 0.6 0.8 1.0 FIGURE 6.27 Flux of a at the interface as a function of the mole fraction of a in the liquid. Dab = 1 x 10-9 m/s; c, = 1000 moles/m; t = 1 109 s.